diff --git a/package-lock.json b/package-lock.json
index 0d851c4550d7..17b73ff6718b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
         "@sapphire/async-queue": "^1.1.9",
         "@types/node-fetch": "^2.5.12",
         "@types/ws": "^8.2.2",
-        "discord-api-types": "^0.27.1",
+        "discord-api-types": "^0.30.0",
         "form-data": "^4.0.0",
         "node-fetch": "^2.6.1",
         "ws": "^8.4.0"
@@ -4300,9 +4300,9 @@
       }
     },
     "node_modules/discord-api-types": {
-      "version": "0.27.1",
-      "resolved": "https://registry.npmjs.org/discord-api-types/-/discord-api-types-0.27.1.tgz",
-      "integrity": "sha512-NhOrRs3TDx/p/e7+VCzcvtVz/Wkqa/olS82HJb2aM/oI0CLcnB+lJMXWa8wjn57XviFBcMMR0poqUMXx0IqTkQ=="
+      "version": "0.30.0",
+      "resolved": "https://registry.npmjs.org/discord-api-types/-/discord-api-types-0.30.0.tgz",
+      "integrity": "sha512-wYst0jrT8EJs2tVlwUTQ2xT0oWMjUrRMpFTkNY3NMleWyQNHgWaKhqFfxdLPdC2im9IuR5EsxcEgjhf/npeftw=="
     },
     "node_modules/dmd": {
       "version": "4.0.6",
@@ -16064,9 +16064,9 @@
       }
     },
     "discord-api-types": {
-      "version": "0.27.1",
-      "resolved": "https://registry.npmjs.org/discord-api-types/-/discord-api-types-0.27.1.tgz",
-      "integrity": "sha512-NhOrRs3TDx/p/e7+VCzcvtVz/Wkqa/olS82HJb2aM/oI0CLcnB+lJMXWa8wjn57XviFBcMMR0poqUMXx0IqTkQ=="
+      "version": "0.30.0",
+      "resolved": "https://registry.npmjs.org/discord-api-types/-/discord-api-types-0.30.0.tgz",
+      "integrity": "sha512-wYst0jrT8EJs2tVlwUTQ2xT0oWMjUrRMpFTkNY3NMleWyQNHgWaKhqFfxdLPdC2im9IuR5EsxcEgjhf/npeftw=="
     },
     "dmd": {
       "version": "4.0.6",
diff --git a/package.json b/package.json
index cb64a6a480ba..5411ae5ee2d7 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "@sapphire/async-queue": "^1.1.9",
     "@types/node-fetch": "^2.5.12",
     "@types/ws": "^8.2.2",
-    "discord-api-types": "^0.27.1",
+    "discord-api-types": "^0.30.0",
     "form-data": "^4.0.0",
     "node-fetch": "^2.6.1",
     "ws": "^8.4.0"
diff --git a/src/managers/ApplicationCommandManager.js b/src/managers/ApplicationCommandManager.js
index 5456dd578f4e..a163fb497a40 100644
--- a/src/managers/ApplicationCommandManager.js
+++ b/src/managers/ApplicationCommandManager.js
@@ -64,6 +64,8 @@ class ApplicationCommandManager extends CachedManager {
    * Options used to fetch Application Commands from Discord
    * @typedef {BaseFetchOptions} FetchApplicationCommandOptions
    * @property {Snowflake} [guildId] The guild's id to fetch commands for, for when the guild is not cached
+   * @property {LocaleString} [locale] The locale to use when fetching this command
+   * @property {boolean} [withLocalizations] Whether to fetch all localization data
    */
 
   /**
@@ -82,9 +84,9 @@ class ApplicationCommandManager extends CachedManager {
    *   .then(commands => console.log(`Fetched ${commands.size} commands`))
    *   .catch(console.error);
    */
-  async fetch(id, { guildId, cache = true, force = false } = {}) {
+  async fetch(id, { guildId, cache = true, force = false, locale, withLocalizations } = {}) {
     if (typeof id === 'object') {
-      ({ guildId, cache = true } = id);
+      ({ guildId, cache = true, locale, withLocalizations } = id);
     } else if (id) {
       if (!force) {
         const existing = this.cache.get(id);
@@ -94,7 +96,15 @@ class ApplicationCommandManager extends CachedManager {
       return this._add(command, cache);
     }
 
-    const data = await this.commandPath({ guildId }).get();
+    const data = await this.commandPath({ guildId }).get({
+      headers: {
+        'X-Discord-Locale': locale,
+      },
+      query:
+        typeof withLocalizations === 'boolean'
+          ? new URLSearchParams({ with_localizations: withLocalizations })
+          : undefined,
+    });
     return data.reduce((coll, command) => coll.set(command.id, this._add(command, cache, guildId)), new Collection());
   }
 
@@ -206,7 +216,9 @@ class ApplicationCommandManager extends CachedManager {
   static transformCommand(command) {
     return {
       name: command.name,
+      name_localizations: command.nameLocalizations ?? command.name_localizations,
       description: command.description,
+      description_localizations: command.descriptionLocalizations ?? command.description_localizations,
       type: typeof command.type === 'number' ? command.type : ApplicationCommandTypes[command.type],
       options: command.options?.map(o => ApplicationCommand.transformOption(o)),
       default_permission: command.defaultPermission ?? command.default_permission,
diff --git a/src/structures/ApplicationCommand.js b/src/structures/ApplicationCommand.js
index ea4558efc71c..03e02ffbaf94 100644
--- a/src/structures/ApplicationCommand.js
+++ b/src/structures/ApplicationCommand.js
@@ -62,6 +62,26 @@ class ApplicationCommand extends Base {
       this.name = data.name;
     }
 
+    if ('name_localizations' in data) {
+      /**
+       * The name localizations for this command
+       * @type {?Object<string, string>}
+       */
+      this.nameLocalizations = data.name_localizations;
+    } else {
+      this.nameLocalizations ??= null;
+    }
+
+    if ('name_localized' in data) {
+      /**
+       * The localized name for this command
+       * @type {?Object<string, string>}
+       */
+      this.nameLocalized = data.name_localized;
+    } else {
+      this.nameLocalized ??= null;
+    }
+
     if ('description' in data) {
       /**
        * The description of this command
@@ -70,6 +90,26 @@ class ApplicationCommand extends Base {
       this.description = data.description;
     }
 
+    if ('description_localizations' in data) {
+      /**
+       * The description localizations for this command
+       * @type {?string}
+       */
+      this.descriptionLocalizations = data.description_localizations;
+    } else {
+      this.descriptionLocalizations ??= null;
+    }
+
+    if ('description_localized' in data) {
+      /**
+       * The localized description for this command
+       * @type {?string}
+       */
+      this.descriptionLocalized = data.description_localized;
+    } else {
+      this.descriptionLocalized ??= null;
+    }
+
     if ('options' in data) {
       /**
        * The options of this command
@@ -128,7 +168,9 @@ class ApplicationCommand extends Base {
    * Data for creating or editing an application command.
    * @typedef {Object} ApplicationCommandData
    * @property {string} name The name of the command
+   * @property {Object<string, string>} [nameLocalizations] The localizations for the command name
    * @property {string} description The description of the command
+   * @property {Object<string, string>} [descriptionLocalizations] The localizations for the command description
    * @property {ApplicationCommandType} [type] The type of the command
    * @property {ApplicationCommandOptionData[]} [options] Options for the command
    * @property {boolean} [defaultPermission] Whether the command is enabled by default when the app is added to a guild
@@ -143,10 +185,12 @@ class ApplicationCommand extends Base {
    * @typedef {Object} ApplicationCommandOptionData
    * @property {ApplicationCommandOptionType|number} type The type of the option
    * @property {string} name The name of the option
+   * @property {Object<string, string>} [nameLocalizations] The name localizations for the option
    * @property {string} description The description of the option
+   * @property {Object<string, string>} [descriptionLocalizations] The description localizations for the option
    * @property {boolean} [autocomplete] Whether the option is an autocomplete option
    * @property {boolean} [required] Whether the option is required
-   * @property {ApplicationCommandOptionChoice[]} [choices] The choices of the option for the user to pick from
+   * @property {ApplicationCommandOptionChoiceData[]} [choices] The choices of the option for the user to pick from
    * @property {ApplicationCommandOptionData[]} [options] Additional options if this option is a subcommand (group)
    * @property {ChannelType[]|number[]} [channelTypes] When the option type is channel,
    * the allowed types of channels that can be selected
@@ -154,6 +198,18 @@ class ApplicationCommand extends Base {
    * @property {number} [maxValue] The maximum value for an `INTEGER` or `NUMBER` option
    */
 
+  /**
+   * @typedef {Object} ApplicationCommandOptionChoiceData
+   * @property {string} name The name of the choice
+   * @property {Object<string, string>} [nameLocalizations] The localized names for this choice
+   * @property {string|number} value The value of the choice
+   */
+
+  /**
+   * @param {ApplicationCommandOptionChoiceData} ApplicationCommandOptionChoice
+   * @property {string} [nameLocalized] The localized name for this choice
+   */
+
   /**
    * Edits this application command.
    * @param {ApplicationCommandData} data The data to update the command with
@@ -179,6 +235,23 @@ class ApplicationCommand extends Base {
     return this.edit({ name });
   }
 
+  /**
+   * Edits the localized names of this ApplicationCommand
+   * @param {Object<string, string>} nameLocalizations The new localized names for the command
+   * @returns {Promise<ApplicationCommand>}
+   * @example
+   * // Edit the name localizations of this command
+   * command.setLocalizedNames({
+   *   'en-GB': 'test',
+   *   'pt-BR': 'teste',
+   * })
+   *   .then(console.log)
+   *   .catch(console.error)
+   */
+  setNameLocalizations(nameLocalizations) {
+    return this.edit({ nameLocalizations });
+  }
+
   /**
    * Edits the description of this ApplicationCommand
    * @param {string} description The new description of the command
@@ -188,6 +261,23 @@ class ApplicationCommand extends Base {
     return this.edit({ description });
   }
 
+  /**
+   * Edits the localized descriptions of this ApplicationCommand
+   * @param {Object<string, string>} descriptionLocalizations The new localized descriptions for the command
+   * @returns {Promise<ApplicationCommand>}
+   * @example
+   * // Edit the description localizations of this command
+   * command.setLocalizedDescriptions({
+   *   'en-GB': 'A test command',
+   *   'pt-BR': 'Um comando de teste',
+   * })
+   *   .then(console.log)
+   *   .catch(console.error)
+   */
+  setDescriptionLocalizations(descriptionLocalizations) {
+    return this.edit({ descriptionLocalizations });
+  }
+
   /**
    * Edits the default permission of this ApplicationCommand
    * @param {boolean} [defaultPermission=true] The default permission for this command
@@ -344,7 +434,11 @@ class ApplicationCommand extends Base {
    * @typedef {Object} ApplicationCommandOption
    * @property {ApplicationCommandOptionType} type The type of the option
    * @property {string} name The name of the option
+   * @property {Object<string, string>} [nameLocalizations] The localizations for the option name
+   * @property {string} [nameLocalized] The localized name for this option
    * @property {string} description The description of the option
+   * @property {Object<string, string>} [descriptionLocalizations] The localizations for the option description
+   * @property {string} [descriptionLocalized] The localized description for this option
    * @property {boolean} [required] Whether the option is required
    * @property {boolean} [autocomplete] Whether the option is an autocomplete option
    * @property {ApplicationCommandOptionChoice[]} [choices] The choices of the option for the user to pick from
@@ -359,12 +453,14 @@ class ApplicationCommand extends Base {
    * A choice for an application command option.
    * @typedef {Object} ApplicationCommandOptionChoice
    * @property {string} name The name of the choice
+   * @property {string} [nameLocalized] The localized name for this choice
+   * @property {Object<string, string>} [nameLocalizations] The localized names for this choice
    * @property {string|number} value The value of the choice
    */
 
   /**
    * Transforms an {@link ApplicationCommandOptionData} object into something that can be used with the API.
-   * @param {ApplicationCommandOptionData} option The option to transform
+   * @param {ApplicationCommandOptionData|ApplicationCommandOption} option The option to transform
    * @param {boolean} [received] Whether this option has been received from Discord
    * @returns {APIApplicationCommandOption}
    * @private
@@ -374,14 +470,27 @@ class ApplicationCommand extends Base {
     const channelTypesKey = received ? 'channelTypes' : 'channel_types';
     const minValueKey = received ? 'minValue' : 'min_value';
     const maxValueKey = received ? 'maxValue' : 'max_value';
+    const nameLocalizationsKey = received ? 'nameLocalizations' : 'name_localizations';
+    const nameLocalizedKey = received ? 'nameLocalized' : 'name_localized';
+    const descriptionLocalizationsKey = received ? 'descriptionLocalizations' : 'description_localizations';
+    const descriptionLocalizedKey = received ? 'descriptionLocalized' : 'description_localized';
     return {
       type: typeof option.type === 'number' && !received ? option.type : ApplicationCommandOptionTypes[option.type],
       name: option.name,
+      [nameLocalizationsKey]: option.nameLocalizations ?? option.name_localizations,
+      [nameLocalizedKey]: option.nameLocalized ?? option.name_localized,
       description: option.description,
+      [descriptionLocalizationsKey]: option.descriptionLocalizations ?? option.description_localizations,
+      [descriptionLocalizedKey]: option.descriptionLocalized ?? option.description_localized,
       required:
         option.required ?? (stringType === 'SUB_COMMAND' || stringType === 'SUB_COMMAND_GROUP' ? undefined : false),
       autocomplete: option.autocomplete,
-      choices: option.choices,
+      choices: option.choices?.map(choice => ({
+        name: choice.name,
+        [nameLocalizedKey]: choice.nameLocalized ?? choice.name_localized,
+        [nameLocalizationsKey]: choice.nameLocalizations ?? choice.name_localizations,
+        value: choice.value,
+      })),
       options: option.options?.map(o => this.transformOption(o, received)),
       [channelTypesKey]: received
         ? option.channel_types?.map(type => ChannelTypes[type])
diff --git a/src/structures/AutocompleteInteraction.js b/src/structures/AutocompleteInteraction.js
index e942a6dc4558..3f1a2e3013e9 100644
--- a/src/structures/AutocompleteInteraction.js
+++ b/src/structures/AutocompleteInteraction.js
@@ -76,7 +76,7 @@ class AutocompleteInteraction extends Interaction {
 
   /**
    * Sends results for the autocomplete of this interaction.
-   * @param {ApplicationCommandOptionChoice[]} options The options for the autocomplete
+   * @param {ApplicationCommandOptionChoiceData[]} options The options for the autocomplete
    * @returns {Promise<void>}
    * @example
    * // respond to autocomplete interaction
diff --git a/typings/index.d.ts b/typings/index.d.ts
index fbb85d02eb16..cac235ab232e 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -52,6 +52,8 @@ import {
   GatewayVoiceStateUpdateDispatchData,
   RESTPostAPIApplicationCommandsJSONBody,
   Snowflake,
+  LocalizationMap,
+  LocaleString,
 } from 'discord-api-types/v9';
 import { ChildProcess } from 'node:child_process';
 import { EventEmitter } from 'node:events';
@@ -223,12 +225,16 @@ export class ApplicationCommand<PermissionsFetchType = {}> extends Base {
   public readonly createdTimestamp: number;
   public defaultPermission: boolean;
   public description: string;
+  public descriptionLocalizations: LocalizationMap | null;
+  public descriptionLocalized: string | null;
   public guild: Guild | null;
   public guildId: Snowflake | null;
   public readonly manager: ApplicationCommandManager;
   public id: Snowflake;
   public name: string;
-  public options: ApplicationCommandOption[];
+  public nameLocalizations: LocalizationMap | null;
+  public nameLocalized: string | null;
+  public options: (ApplicationCommandOption & { nameLocalized?: string; descriptionLocalized?: string })[];
   public permissions: ApplicationCommandPermissionsManager<
     PermissionsFetchType,
     PermissionsFetchType,
@@ -241,7 +247,11 @@ export class ApplicationCommand<PermissionsFetchType = {}> extends Base {
   public delete(): Promise<ApplicationCommand<PermissionsFetchType>>;
   public edit(data: ApplicationCommandData): Promise<ApplicationCommand<PermissionsFetchType>>;
   public setName(name: string): Promise<ApplicationCommand<PermissionsFetchType>>;
+  public setNameLocalizations(nameLocalizations: LocalizationMap): Promise<ApplicationCommand<PermissionsFetchType>>;
   public setDescription(description: string): Promise<ApplicationCommand<PermissionsFetchType>>;
+  public setDescriptionLocalizations(
+    descriptionLocalizations: LocalizationMap,
+  ): Promise<ApplicationCommand<PermissionsFetchType>>;
   public setDefaultPermission(defaultPermission?: boolean): Promise<ApplicationCommand<PermissionsFetchType>>;
   public setOptions(options: ApplicationCommandOptionData[]): Promise<ApplicationCommand<PermissionsFetchType>>;
   public equals(
@@ -773,7 +783,7 @@ export class AutocompleteInteraction<Cached extends CacheType = CacheType> exten
   public inCachedGuild(): this is AutocompleteInteraction<'cached'>;
   public inRawGuild(): this is AutocompleteInteraction<'raw'>;
   private transformOption(option: APIApplicationCommandOption): CommandInteractionOption;
-  public respond(options: ApplicationCommandOptionChoice[]): Promise<void>;
+  public respond(options: ApplicationCommandOptionChoiceData[]): Promise<void>;
 }
 
 export class CommandInteractionOptionResolver<Cached extends CacheType = CacheType> {
@@ -830,7 +840,7 @@ export class CommandInteractionOptionResolver<Cached extends CacheType = CacheTy
   ): NonNullable<CommandInteractionOption<Cached>['member' | 'role' | 'user']> | null;
   public getMessage(name: string, required: true): NonNullable<CommandInteractionOption<Cached>['message']>;
   public getMessage(name: string, required?: boolean): NonNullable<CommandInteractionOption<Cached>['message']> | null;
-  public getFocused(getFull: true): ApplicationCommandOptionChoice;
+  public getFocused(getFull: true): ApplicationCommandOptionChoiceData;
   public getFocused(getFull?: boolean): string | number;
   public getAttachment(name: string, required: true): NonNullable<CommandInteractionOption<Cached>['attachment']>;
   public getAttachment(
@@ -3136,6 +3146,8 @@ export class ChannelManager extends CachedManager<Snowflake, AnyChannel, Channel
   public fetch(id: Snowflake, options?: FetchChannelOptions): Promise<AnyChannel | null>;
 }
 
+export type FetchGuildApplicationCommandFetchOptions = Omit<FetchApplicationCommandOptions, 'guildId'>;
+
 export class GuildApplicationCommandManager extends ApplicationCommandManager<ApplicationCommand, {}, Guild> {
   private constructor(guild: Guild, iterable?: Iterable<RawApplicationCommandData>);
   public guild: Guild;
@@ -3145,9 +3157,12 @@ export class GuildApplicationCommandManager extends ApplicationCommandManager<Ap
     command: ApplicationCommandResolvable,
     data: ApplicationCommandDataResolvable,
   ): Promise<ApplicationCommand>;
-  public fetch(id: Snowflake, options?: BaseFetchOptions): Promise<ApplicationCommand>;
-  public fetch(options: BaseFetchOptions): Promise<Collection<Snowflake, ApplicationCommand>>;
-  public fetch(id?: undefined, options?: BaseFetchOptions): Promise<Collection<Snowflake, ApplicationCommand>>;
+  public fetch(id: Snowflake, options?: FetchGuildApplicationCommandFetchOptions): Promise<ApplicationCommand>;
+  public fetch(options: FetchGuildApplicationCommandFetchOptions): Promise<Collection<Snowflake, ApplicationCommand>>;
+  public fetch(
+    id?: undefined,
+    options?: FetchGuildApplicationCommandFetchOptions,
+  ): Promise<Collection<Snowflake, ApplicationCommand>>;
   public set(commands: ApplicationCommandDataResolvable[]): Promise<Collection<Snowflake, ApplicationCommand>>;
 }
 
@@ -3738,6 +3753,7 @@ export interface ApplicationAsset {
 
 export interface BaseApplicationCommandData {
   name: string;
+  nameLocalizations?: LocalizationMap;
   defaultPermission?: boolean;
 }
 
@@ -3769,7 +3785,9 @@ export type CommandOptionNonChoiceResolvableType = Exclude<
 
 export interface BaseApplicationCommandOptionsData {
   name: string;
+  nameLocalizations?: LocalizationMap;
   description: string;
+  descriptionLocalizations?: LocalizationMap;
   required?: boolean;
   autocomplete?: never;
 }
@@ -3784,6 +3802,7 @@ export interface MessageApplicationCommandData extends BaseApplicationCommandDat
 
 export interface ChatInputApplicationCommandData extends BaseApplicationCommandData {
   description: string;
+  descriptionLocalizations?: LocalizationMap;
   type?: 'CHAT_INPUT' | ApplicationCommandTypes.CHAT_INPUT;
   options?: ApplicationCommandOptionData[];
 }
@@ -3817,13 +3836,13 @@ export interface ApplicationCommandAutocompleteOption extends Omit<BaseApplicati
 
 export interface ApplicationCommandChoicesData extends Omit<BaseApplicationCommandOptionsData, 'autocomplete'> {
   type: CommandOptionChoiceResolvableType;
-  choices?: ApplicationCommandOptionChoice[];
+  choices?: ApplicationCommandOptionChoiceData[];
   autocomplete?: false;
 }
 
 export interface ApplicationCommandChoicesOption extends Omit<BaseApplicationCommandOptionsData, 'autocomplete'> {
   type: Exclude<CommandOptionChoiceResolvableType, ApplicationCommandOptionTypes>;
-  choices?: ApplicationCommandOptionChoice[];
+  choices?: ApplicationCommandOptionChoiceData[];
   autocomplete?: false;
 }
 
@@ -3892,11 +3911,16 @@ export type ApplicationCommandOption =
   | ApplicationCommandNumericOption
   | ApplicationCommandSubCommand;
 
-export interface ApplicationCommandOptionChoice {
+export interface ApplicationCommandOptionChoiceData {
   name: string;
+  nameLocalizations?: LocalizationMap;
   value: string | number;
 }
 
+export interface ApplicationCommandOptionChoice extends ApplicationCommandOptionChoiceData {
+  nameLocalized?: string;
+}
+
 export type ApplicationCommandType = keyof typeof ApplicationCommandTypes;
 
 export type ApplicationCommandOptionType = keyof typeof ApplicationCommandOptionTypes;
@@ -4558,6 +4582,8 @@ export type ExplicitContentFilterLevel = keyof typeof ExplicitContentFilterLevel
 
 export interface FetchApplicationCommandOptions extends BaseFetchOptions {
   guildId?: Snowflake;
+  locale?: LocaleString;
+  withLocalizations?: boolean;
 }
 
 export interface FetchArchivedThreadOptions {