diff --git a/packages/angular/migrations.json b/packages/angular/migrations.json
index c3694aeeb4795..006864a21f972 100644
--- a/packages/angular/migrations.json
+++ b/packages/angular/migrations.json
@@ -84,6 +84,12 @@
       "version": "12.3.5-beta.0",
       "description": "Convert targets using @nrwl/angular:webpack-browser with the buildTarget option set to use the @nrwl/angular:delegate-build executor instead.",
       "factory": "./src/migrations/update-12-3-0/convert-webpack-browser-build-target-to-delegate-build"
+    },
+    "update-invalid-import-paths": {
+      "cli": "nx",
+      "version": "12.9.0",
+      "description": "Fixes invalid importPaths for buildable and publishable libs.",
+      "factory": "./src/migrations/update-12-9-0/update-invalid-import-paths"
     }
   },
   "packageJsonUpdates": {
diff --git a/packages/angular/src/migrations/update-12-9-0/update-invalid-import-paths.spec.ts b/packages/angular/src/migrations/update-12-9-0/update-invalid-import-paths.spec.ts
new file mode 100644
index 0000000000000..e9d5c2c5ea183
--- /dev/null
+++ b/packages/angular/src/migrations/update-12-9-0/update-invalid-import-paths.spec.ts
@@ -0,0 +1,85 @@
+import type { Tree } from '@nrwl/devkit';
+import { updateJson, joinPathFragments, readJson } from '@nrwl/devkit';
+import { createTreeWithEmptyWorkspace } from '@nrwl/devkit/testing';
+
+import libGenerator from '../../generators/library/library';
+import updateInvalidImportPaths from './update-invalid-import-paths';
+
+describe('Migration to fix invalid import paths in affected workspaces', () => {
+  let tree: Tree;
+
+  beforeEach(async () => {
+    tree = createTreeWithEmptyWorkspace();
+
+    // set up some libs
+
+    await libGenerator(tree, {
+      name: 'buildable1',
+      buildable: true,
+      directory: 'dir1',
+    });
+
+    await libGenerator(tree, {
+      name: 'buildable2',
+      buildable: true,
+      directory: 'dir1',
+    });
+
+    await libGenerator(tree, {
+      name: 'publishable1',
+      publishable: true,
+      directory: 'dir1',
+      importPath: '@proj/publishable1',
+    });
+
+    await libGenerator(tree, {
+      name: 'publishable2',
+      publishable: true,
+      directory: 'dir1',
+      importPath: '@proj/publishable2',
+    });
+
+    // break one of each kind
+    updateJson(
+      tree,
+      joinPathFragments('libs/dir1/buildable1', 'package.json'),
+      (pkgJson) => {
+        pkgJson.name = '@proj/dir1-buildable1';
+        return pkgJson;
+      }
+    );
+
+    updateJson(tree, 'tsconfig.base.json', (tsconfig) => {
+      const srcPath = tsconfig['@proj/publishable2'];
+      tsconfig['@proj/publishable2'] = undefined;
+
+      tsconfig['@proj/dir1/publishable2'] = srcPath;
+
+      return tsconfig;
+    });
+  });
+
+  it('should fix the invalid libraries', async () => {
+    // ACT
+    await updateInvalidImportPaths(tree);
+
+    // ASSERT
+    const fixedBuildable = readJson(
+      tree,
+      joinPathFragments('libs/dir1/buildable1', 'package.json')
+    );
+
+    const { compilerOptions } = readJson<{
+      compilerOptions: { paths: Record<string, string[]> };
+    }>(tree, 'tsconfig.base.json');
+    const { paths: tsConfigPaths } = compilerOptions;
+    const fixedPublishable = Boolean(tsConfigPaths['@proj/publishable2']);
+    const brokenPublishableShouldntExist = !Boolean(
+      tsConfigPaths['@proj/publishable2']
+    );
+
+    expect(fixedBuildable.name).toEqual('@proj/dir1/buildable1');
+    expect(fixedPublishable).toBeTruthy();
+    expect(brokenPublishableShouldntExist).toBeFalsy();
+  });
+});
diff --git a/packages/angular/src/migrations/update-12-9-0/update-invalid-import-paths.ts b/packages/angular/src/migrations/update-12-9-0/update-invalid-import-paths.ts
new file mode 100644
index 0000000000000..b9b0e8a4f93cf
--- /dev/null
+++ b/packages/angular/src/migrations/update-12-9-0/update-invalid-import-paths.ts
@@ -0,0 +1,140 @@
+import type {
+  NxJsonProjectConfiguration,
+  ProjectConfiguration,
+  Tree,
+} from '@nrwl/devkit';
+import {
+  formatFiles,
+  getProjects,
+  readJson,
+  joinPathFragments,
+  updateJson,
+  logger,
+} from '@nrwl/devkit';
+
+type AffectedLib = ProjectConfiguration & NxJsonProjectConfiguration;
+type InvalidLibs = {
+  buildableLibs: AffectedLib[];
+  publishableLibs: AffectedLib[];
+};
+
+export default async function (tree: Tree) {
+  const possibleAffectedLibs = findBuildableAndPublishableLibs(tree);
+  const invalidLibs = findInvalidLibs(tree, possibleAffectedLibs);
+  fixLibs(tree, invalidLibs);
+
+  await formatFiles(tree);
+}
+
+export function findBuildableAndPublishableLibs(tree: Tree): InvalidLibs {
+  const projects = getProjects(tree);
+  const buildableLibs: AffectedLib[] = [];
+  const publishableLibs: AffectedLib[] = [];
+
+  for (const [name, project] of projects) {
+    for (const target of Object.values(project.targets || {})) {
+      if (target.executor === '@nrwl/angular:package') {
+        publishableLibs.push(project);
+      } else if (target.executor === '@nrwl/angular:ng-packagr-lite') {
+        buildableLibs.push(project);
+      }
+    }
+  }
+
+  return { buildableLibs, publishableLibs };
+}
+
+export function findInvalidLibs(tree: Tree, libs: InvalidLibs): InvalidLibs {
+  const { compilerOptions } = readJson(tree, 'tsconfig.base.json');
+  const { paths: tsConfigPaths } = compilerOptions;
+
+  const invalidBuildableLibs = libs.buildableLibs.filter((lib) =>
+    checkInvalidLib(tree, lib, tsConfigPaths)
+  );
+  const invalidPublishableLibs = libs.publishableLibs.filter((lib) =>
+    checkInvalidLib(tree, lib, tsConfigPaths)
+  );
+  return {
+    buildableLibs: invalidBuildableLibs,
+    publishableLibs: invalidPublishableLibs,
+  };
+}
+
+function checkInvalidLib(
+  tree: Tree,
+  lib: AffectedLib,
+  tsConfigPaths: Record<string, string>
+) {
+  const { name } = readJson(tree, joinPathFragments(lib.root, 'package.json'));
+  return !tsConfigPaths[name];
+}
+
+function fixLibs(tree: Tree, { buildableLibs, publishableLibs }: InvalidLibs) {
+  const { compilerOptions } = readJson(tree, 'tsconfig.base.json');
+  const { paths: tsConfigPaths } = compilerOptions;
+
+  buildableLibs.map((lib) => fixBuildableLib(tree, lib, tsConfigPaths));
+  publishableLibs.map((lib) => fixPublishableLib(tree, lib, tsConfigPaths));
+}
+
+function fixBuildableLib(
+  tree: Tree,
+  lib: AffectedLib,
+  tsConfigPaths: Record<string, string>
+) {
+  const srcRoot = joinPathFragments(lib.sourceRoot, 'index.ts');
+
+  for (const [validPackageName, tsLibSrcRoot] of Object.entries(
+    tsConfigPaths
+  )) {
+    if (tsLibSrcRoot[0] === srcRoot) {
+      updateJson(
+        tree,
+        joinPathFragments(lib.root, 'package.json'),
+        (pkgJson) => {
+          pkgJson.name = validPackageName;
+
+          return pkgJson;
+        }
+      );
+      break;
+    }
+  }
+}
+
+function fixPublishableLib(
+  tree: Tree,
+  lib: AffectedLib,
+  tsConfigPaths: Record<string, string>
+) {
+  const srcRoot = joinPathFragments(lib.sourceRoot, 'index.ts');
+  const { name: pkgName } = readJson(
+    tree,
+    joinPathFragments(lib.root, 'package.json')
+  );
+
+  const pkgNameParts = pkgName.split('/');
+  if (Array.isArray(pkgNameParts) && pkgNameParts.length > 2) {
+    logger.warn(
+      `Your publishable package ${pkgName} is an invalid NPM Package name. Please ensure it only contains one '/'.`
+    );
+    logger.warn(
+      `The affected package.json is at '${joinPathFragments(
+        lib.root,
+        'package.json'
+      )}'`
+    );
+  }
+
+  for (const [invalidPathKey, tsLibSrcRoot] of Object.entries(tsConfigPaths)) {
+    if (tsLibSrcRoot[0] === srcRoot) {
+      updateJson(tree, 'tsconfig.base.json', (tsconfig) => {
+        tsconfig.compilerOptions.paths[invalidPathKey] = undefined;
+        tsconfig.compilerOptions.paths[pkgName] = tsLibSrcRoot;
+
+        return tsconfig;
+      });
+      break;
+    }
+  }
+}