diff --git a/.changeset/smart-phones-exist.md b/.changeset/smart-phones-exist.md
new file mode 100644
index 0000000000..eb1c3d041a
--- /dev/null
+++ b/.changeset/smart-phones-exist.md
@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Added a new experimental `repo list-deprecations` command, which scans the entire project for usage of deprecated APIs.
diff --git a/packages/cli/package.json b/packages/cli/package.json
index f9147b924e..66b0456e32 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -68,15 +68,16 @@
     "esbuild": "^0.14.10",
     "esbuild-loader": "^2.18.0",
     "eslint": "^8.6.0",
-    "eslint-webpack-plugin": "^2.6.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-formatter-friendly": "^7.0.0",
+    "eslint-plugin-deprecation": "^1.3.2",
     "eslint-plugin-import": "^2.25.4",
     "eslint-plugin-jest": "^25.3.4",
     "eslint-plugin-jsx-a11y": "^6.5.1",
     "eslint-plugin-monorepo": "^0.3.2",
     "eslint-plugin-react": "^7.28.0",
     "eslint-plugin-react-hooks": "^4.3.0",
+    "eslint-webpack-plugin": "^2.6.0",
     "express": "^4.17.1",
     "fork-ts-checker-webpack-plugin": "^7.0.0-alpha.8",
     "fs-extra": "10.0.1",
@@ -86,13 +87,13 @@
     "inquirer": "^8.2.0",
     "jest": "^26.0.1",
     "jest-css-modules": "^2.1.0",
-    "json-schema": "^0.4.0",
     "jest-transform-yaml": "^1.0.0",
+    "json-schema": "^0.4.0",
     "lodash": "^4.17.21",
-    "minimatch": "5.0.1",
     "mini-css-extract-plugin": "^2.4.2",
-    "npm-packlist": "^3.0.0",
+    "minimatch": "5.0.1",
     "node-libs-browser": "^2.2.1",
+    "npm-packlist": "^3.0.0",
     "ora": "^5.3.0",
     "postcss": "^8.1.0",
     "process": "^0.11.10",
@@ -123,9 +124,9 @@
   "devDependencies": {
     "@backstage/backend-common": "^0.13.1",
     "@backstage/config": "^1.0.0",
+    "@backstage/core-app-api": "^1.0.0",
     "@backstage/core-components": "^0.9.2",
     "@backstage/core-plugin-api": "^1.0.0",
-    "@backstage/core-app-api": "^1.0.0",
     "@backstage/dev-utils": "^1.0.0",
     "@backstage/test-utils": "^1.0.0",
     "@backstage/theme": "^0.2.15",
@@ -147,9 +148,9 @@
     "@types/yarnpkg__lockfile": "^1.1.4",
     "del": "^6.0.0",
     "mock-fs": "^5.1.0",
+    "msw": "^0.35.0",
     "nodemon": "^2.0.2",
-    "ts-node": "^10.0.0",
-    "msw": "^0.35.0"
+    "ts-node": "^10.0.0"
   },
   "peerDependencies": {
     "@microsoft/api-extractor": "^7.19.2"
diff --git a/packages/cli/src/commands/index.ts b/packages/cli/src/commands/index.ts
index bc427bb19b..43cb557828 100644
--- a/packages/cli/src/commands/index.ts
+++ b/packages/cli/src/commands/index.ts
@@ -59,6 +59,14 @@ export function registerRepoCommand(program: CommanderStatic) {
     )
     .option('--fix', 'Attempt to automatically fix violations')
     .action(lazy(() => import('./repo/lint').then(m => m.command)));
+
+  command
+    .command('list-deprecations', { hidden: true })
+    .description('List deprecations. [EXPERIMENTAL]')
+    .option('--json', 'Output as JSON')
+    .action(
+      lazy(() => import('./repo/list-deprecations').then(m => m.command)),
+    );
 }
 
 export function registerScriptCommand(program: CommanderStatic) {
diff --git a/packages/cli/src/commands/repo/list-deprecations.ts b/packages/cli/src/commands/repo/list-deprecations.ts
new file mode 100644
index 0000000000..b53118cc40
--- /dev/null
+++ b/packages/cli/src/commands/repo/list-deprecations.ts
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2020 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import chalk from 'chalk';
+import { ESLint } from 'eslint';
+import { Command } from 'commander';
+import { join as joinPath, relative as relativePath } from 'path';
+import { paths } from '../../lib/paths';
+import { PackageGraph } from '../../lib/monorepo';
+
+export async function command(cmd: Command) {
+  const packages = await PackageGraph.listTargetPackages();
+
+  const eslint = new ESLint({
+    cwd: paths.targetDir,
+    overrideConfig: {
+      plugins: ['deprecation'],
+      rules: {
+        'deprecation/deprecation': 'error',
+      },
+      parserOptions: {
+        project: [paths.resolveTargetRoot('tsconfig.json')],
+      },
+    },
+    extensions: ['jsx', 'ts', 'tsx', 'mjs', 'cjs'],
+  });
+
+  const { stderr } = process;
+  if (stderr.isTTY) {
+    stderr.write('Initializing TypeScript...');
+  }
+
+  const deprecations = [];
+  for (const [index, pkg] of packages.entries()) {
+    const results = await eslint.lintFiles(joinPath(pkg.dir, 'src'));
+    for (const result of results) {
+      for (const message of result.messages) {
+        if (message.ruleId !== 'deprecation/deprecation') {
+          continue;
+        }
+
+        const path = relativePath(paths.targetRoot, result.filePath);
+        deprecations.push({
+          path,
+          message: message.message,
+          line: message.line,
+          column: message.column,
+        });
+      }
+    }
+
+    if (stderr.isTTY) {
+      stderr.clearLine(0);
+      stderr.cursorTo(0);
+      stderr.write(`Scanning packages ${index + 1}/${packages.length}`);
+    }
+  }
+
+  if (stderr.isTTY) {
+    stderr.clearLine(0);
+    stderr.cursorTo(0);
+  }
+
+  if (cmd.json) {
+    console.log(JSON.stringify(deprecations, null, 2));
+  } else {
+    for (const d of deprecations) {
+      const location = `${d.path}:${d.line}:${d.column}`;
+      const wrappedMessage = d.message.replace(/\r?\n\s*/g, ' ');
+      console.log(`${location} - ${chalk.yellow(wrappedMessage)}`);
+    }
+  }
+
+  if (deprecations.length > 0) {
+    process.exit(1);
+  }
+}
diff --git a/yarn.lock b/yarn.lock
index d6ca05e230..96d9301fae 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11622,6 +11622,15 @@ eslint-plugin-cypress@^2.10.3:
   dependencies:
     globals "^11.12.0"
 
+eslint-plugin-deprecation@^1.3.2:
+  version "1.3.2"
+  resolved "https://registry.npmjs.org/eslint-plugin-deprecation/-/eslint-plugin-deprecation-1.3.2.tgz#a8125d28c56158cdfa1a685197e6be8ed86f189e"
+  integrity sha512-z93wbx9w7H/E3ogPw6AZMkkNJ6m51fTZRNZPNQqxQLmx+KKt7aLkMU9wN67s71i+VVHN4tLOZ3zT3QLbnlC0Mg==
+  dependencies:
+    "@typescript-eslint/experimental-utils" "^5.0.0"
+    tslib "^2.3.1"
+    tsutils "^3.21.0"
+
 eslint-plugin-graphql@^4.0.0:
   version "4.0.0"
   resolved "https://registry.npmjs.org/eslint-plugin-graphql/-/eslint-plugin-graphql-4.0.0.tgz#d238ff2baee4d632cfcbe787a7a70a1f50428358"
@@ -23973,7 +23982,7 @@ tslib@^1.8.1, tslib@^1.9.0, tslib@^1.9.3:
   resolved "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
   integrity sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==
 
-tslib@^2, tslib@^2.0.0, tslib@^2.0.1, tslib@^2.0.3, tslib@^2.1.0, tslib@^2.2.0, tslib@^2.3.0, tslib@~2.3.0:
+tslib@^2, tslib@^2.0.0, tslib@^2.0.1, tslib@^2.0.3, tslib@^2.1.0, tslib@^2.2.0, tslib@^2.3.0, tslib@^2.3.1, tslib@~2.3.0:
   version "2.3.1"
   resolved "https://registry.npmjs.org/tslib/-/tslib-2.3.1.tgz#e8a335add5ceae51aa261d32a490158ef042ef01"
   integrity sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw==