diff --git a/.gitignore b/.gitignore
index fe5789a8..1b161fef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,4 @@ test.py
 /test
 .pytest_cache
 .vscode
+*.patch
diff --git a/src/cleo/commands/completions_command.py b/src/cleo/commands/completions_command.py
index ab73aba7..7d67fa0a 100644
--- a/src/cleo/commands/completions_command.py
+++ b/src/cleo/commands/completions_command.py
@@ -8,6 +8,7 @@
 import subprocess
 
 from cleo import helpers
+from cleo._compat import shell_quote
 from cleo.commands.command import Command
 from cleo.commands.completions.templates import TEMPLATES
 
@@ -156,13 +157,14 @@ def render_bash(self) -> str:
         for cmd in sorted(self.application.all().values(), key=lambda c: c.name or ""):
             if cmd.hidden or not cmd.enabled or not cmd.name:
                 continue
-            cmds.append(cmd.name)
+            command_name = shell_quote(cmd.name) if " " in cmd.name else cmd.name
+            cmds.append(command_name)
             options = " ".join(
                 f"--{opt.name}".replace(":", "\\:")
                 for opt in sorted(cmd.definition.options, key=lambda o: o.name)
             )
             cmds_opts += [
-                f"            ({cmd.name})",
+                f"            ({command_name})",
                 f'            opts="${{opts}} {options}"',
                 "            ;;",
                 "",  # newline
@@ -200,13 +202,14 @@ def sanitize(s: str) -> str:
         for cmd in sorted(self.application.all().values(), key=lambda c: c.name or ""):
             if cmd.hidden or not cmd.enabled or not cmd.name:
                 continue
-            cmds.append(self._zsh_describe(cmd.name, sanitize(cmd.description)))
+            command_name = shell_quote(cmd.name) if " " in cmd.name else cmd.name
+            cmds.append(self._zsh_describe(command_name, sanitize(cmd.description)))
             options = " ".join(
                 self._zsh_describe(f"--{opt.name}", sanitize(opt.description))
                 for opt in sorted(cmd.definition.options, key=lambda o: o.name)
             )
             cmds_opts += [
-                f"            ({cmd.name})",
+                f"            ({command_name})",
                 f"            opts+=({options})",
                 "            ;;",
                 "",  # newline
@@ -243,21 +246,22 @@ def sanitize(s: str) -> str:
         for cmd in sorted(self.application.all().values(), key=lambda c: c.name or ""):
             if cmd.hidden or not cmd.enabled or not cmd.name:
                 continue
+            command_name = shell_quote(cmd.name) if " " in cmd.name else cmd.name
             cmds.append(
                 f"complete -c {script_name} -f -n '__fish{function}_no_subcommand' "
-                f"-a {cmd.name} -d '{sanitize(cmd.description)}'"
+                f"-a {command_name} -d '{sanitize(cmd.description)}'"
             )
             cmds_opts += [
-                f"# {cmd.name}",
+                f"# {command_name}",
                 *[
                     f"complete -c {script_name} -A "
-                    f"-n '__fish_seen_subcommand_from {cmd.name}' "
+                    f"-n '__fish_seen_subcommand_from {command_name}' "
                     f"-l {opt.name} -d '{sanitize(opt.description)}'"
                     for opt in sorted(cmd.definition.options, key=lambda o: o.name)
                 ],
                 "",  # newline
             ]
-            cmds_names.append(cmd.name)
+            cmds_names.append(command_name)
 
         return TEMPLATES["fish"] % {
             "script_name": script_name,
diff --git a/tests/commands/completion/fixtures/bash.txt b/tests/commands/completion/fixtures/bash.txt
index 317d1257..b42714e1 100644
--- a/tests/commands/completion/fixtures/bash.txt
+++ b/tests/commands/completion/fixtures/bash.txt
@@ -41,6 +41,10 @@ _my_function()
             opts="${opts} "
             ;;
 
+            ('spaced command')
+            opts="${opts} "
+            ;;
+
         esac
 
         COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
@@ -51,7 +55,7 @@ _my_function()
 
     # completing for a command
     if [[ $cur == $com ]]; then
-        coms="command:with:colons hello help list"
+        coms="command:with:colons hello help list 'spaced command'"
 
         COMPREPLY=($(compgen -W "${coms}" -- ${cur}))
         __ltrim_colon_completions "$cur"
diff --git a/tests/commands/completion/fixtures/command_with_space_in_name.py b/tests/commands/completion/fixtures/command_with_space_in_name.py
new file mode 100644
index 00000000..aeba339b
--- /dev/null
+++ b/tests/commands/completion/fixtures/command_with_space_in_name.py
@@ -0,0 +1,10 @@
+from __future__ import annotations
+
+from cleo.commands.command import Command
+from cleo.helpers import argument
+
+
+class SpacedCommand(Command):
+    name = "spaced command"
+    description = "Command with space in name."
+    arguments = [argument("test", description="test argument")]
diff --git a/tests/commands/completion/fixtures/fish.txt b/tests/commands/completion/fixtures/fish.txt
index 5d1879e1..57c02809 100644
--- a/tests/commands/completion/fixtures/fish.txt
+++ b/tests/commands/completion/fixtures/fish.txt
@@ -1,6 +1,6 @@
 function __fish_my_function_no_subcommand
     for i in (commandline -opc)
-        if contains -- $i command:with:colons hello help list
+        if contains -- $i command:with:colons hello help list 'spaced command'
             return 1
         end
     end
@@ -21,6 +21,7 @@ complete -c script -f -n '__fish_my_function_no_subcommand' -a command:with:colo
 complete -c script -f -n '__fish_my_function_no_subcommand' -a hello -d 'Complete me please.'
 complete -c script -f -n '__fish_my_function_no_subcommand' -a help -d 'Displays help for a command.'
 complete -c script -f -n '__fish_my_function_no_subcommand' -a list -d 'Lists commands.'
+complete -c script -f -n '__fish_my_function_no_subcommand' -a 'spaced command' -d 'Command with space in name.'
 
 # command options
 
@@ -34,3 +35,5 @@ complete -c script -A -n '__fish_seen_subcommand_from hello' -l option-without-d
 # help
 
 # list
+
+# 'spaced command'
diff --git a/tests/commands/completion/fixtures/zsh.txt b/tests/commands/completion/fixtures/zsh.txt
index 5acf0df0..cf133ce6 100644
--- a/tests/commands/completion/fixtures/zsh.txt
+++ b/tests/commands/completion/fixtures/zsh.txt
@@ -21,7 +21,7 @@ _my_function()
         opts+=("--ansi:Force ANSI output." "--help:Display help for the given command. When no command is given display help for the list command." "--no-ansi:Disable ANSI output." "--no-interaction:Do not ask any interactive question." "--quiet:Do not output any message." "--verbose:Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug." "--version:Display this application version.")
     elif [[ $cur == $com ]]; then
         state="command"
-        coms+=("command\:with\:colons:Test." "hello:Complete me please." "help:Displays help for a command." "list:Lists commands.")
+        coms+=("command\:with\:colons:Test." "hello:Complete me please." "help:Displays help for a command." "list:Lists commands." "'spaced command':Command with space in name.")
     fi
 
     case $state in
@@ -47,6 +47,10 @@ _my_function()
             opts+=()
             ;;
 
+            ('spaced command')
+            opts+=()
+            ;;
+
             esac
 
             _describe 'option' opts
diff --git a/tests/commands/completion/test_completions_command.py b/tests/commands/completion/test_completions_command.py
index fb239407..190326a2 100644
--- a/tests/commands/completion/test_completions_command.py
+++ b/tests/commands/completion/test_completions_command.py
@@ -6,9 +6,11 @@
 
 import pytest
 
+from cleo._compat import WINDOWS
 from cleo.application import Application
 from cleo.testers.command_tester import CommandTester
 from tests.commands.completion.fixtures.command_with_colons import CommandWithColons
+from tests.commands.completion.fixtures.command_with_space_in_name import SpacedCommand
 from tests.commands.completion.fixtures.hello_command import HelloCommand
 
 
@@ -19,6 +21,7 @@
 app = Application()
 app.add(HelloCommand())
 app.add(CommandWithColons())
+app.add(SpacedCommand())
 
 
 def test_invalid_shell() -> None:
@@ -29,6 +32,7 @@ def test_invalid_shell() -> None:
         tester.execute("pomodoro")
 
 
+@pytest.mark.skipif(WINDOWS, reason="Only test linux shells")
 def test_bash(mocker: MockerFixture) -> None:
     mocker.patch(
         "cleo.io.inputs.string_input.StringInput.script_name",
@@ -50,6 +54,7 @@ def test_bash(mocker: MockerFixture) -> None:
     assert expected == tester.io.fetch_output().replace("\r\n", "\n")
 
 
+@pytest.mark.skipif(WINDOWS, reason="Only test linux shells")
 def test_zsh(mocker: MockerFixture) -> None:
     mocker.patch(
         "cleo.io.inputs.string_input.StringInput.script_name",
@@ -71,6 +76,7 @@ def test_zsh(mocker: MockerFixture) -> None:
     assert expected == tester.io.fetch_output().replace("\r\n", "\n")
 
 
+@pytest.mark.skipif(WINDOWS, reason="Only test linux shells")
 def test_fish(mocker: MockerFixture) -> None:
     mocker.patch(
         "cleo.io.inputs.string_input.StringInput.script_name",