diff --git a/.changeset/long-clouds-rest.md b/.changeset/long-clouds-rest.md
new file mode 100644
index 0000000000..701be91536
--- /dev/null
+++ b/.changeset/long-clouds-rest.md
@@ -0,0 +1,12 @@
+---
+'@backstage/cli': patch
+---
+
+Introduce `--deprecated` option to `config:check` to log all deprecated app configuration properties
+
+```sh
+$ yarn backstage-cli config:check --lax --deprecated
+config:check --lax --deprecated
+Loaded config from app-config.yaml
+The configuration key 'catalog.processors.githubOrg' of app-config.yaml is deprecated and may be removed soon. Configure a GitHub integration instead.
+```
diff --git a/docs/local-dev/cli-commands.md b/docs/local-dev/cli-commands.md
index 412e3c4598..c65fc30da6 100644
--- a/docs/local-dev/cli-commands.md
+++ b/docs/local-dev/cli-commands.md
@@ -556,6 +556,7 @@ Options:
   --package <name>  Only load config schema that applies to the given package
   --lax             Do not require environment variables to be set
   --frontend        Only validate the frontend configuration
+  --deprecated      List all deprecated configuration settings
   --config <path>   Config files to load instead of app-config.yaml (default: [])
   -h, --help        display help for command
 ```
diff --git a/packages/cli/src/commands/config/validate.ts b/packages/cli/src/commands/config/validate.ts
index 2d3ce60366..8d528b8300 100644
--- a/packages/cli/src/commands/config/validate.ts
+++ b/packages/cli/src/commands/config/validate.ts
@@ -23,5 +23,6 @@ export default async (cmd: Command) => {
     fromPackage: cmd.package,
     mockEnv: cmd.lax,
     fullVisibility: !cmd.frontend,
+    withDeprecatedKeys: cmd.deprecated,
   });
 };
diff --git a/packages/cli/src/commands/index.ts b/packages/cli/src/commands/index.ts
index bef5dfc285..49e700ac1e 100644
--- a/packages/cli/src/commands/index.ts
+++ b/packages/cli/src/commands/index.ts
@@ -193,6 +193,7 @@ export function registerCommands(program: CommanderStatic) {
     )
     .option('--lax', 'Do not require environment variables to be set')
     .option('--frontend', 'Only validate the frontend configuration')
+    .option('--deprecated', 'Output deprecated configuration settings')
     .option(...configOption)
     .description(
       'Validate that the given configuration loads and matches schema',
diff --git a/packages/cli/src/lib/config.ts b/packages/cli/src/lib/config.ts
index 986e409e58..c24021fd0b 100644
--- a/packages/cli/src/lib/config.ts
+++ b/packages/cli/src/lib/config.ts
@@ -28,6 +28,7 @@ type Options = {
   fromPackage?: string;
   mockEnv?: boolean;
   withFilteredKeys?: boolean;
+  withDeprecatedKeys?: boolean;
   fullVisibility?: boolean;
 };
 
@@ -82,6 +83,7 @@ export async function loadCliConfig(options: Options) {
         ? ['frontend', 'backend', 'secret']
         : ['frontend'],
       withFilteredKeys: options.withFilteredKeys,
+      withDeprecatedKeys: options.withDeprecatedKeys,
     });
     const frontendConfig = ConfigReader.fromConfigs(frontendAppConfigs);