diff --git a/.changeset/strong-moose-work.md b/.changeset/strong-moose-work.md
new file mode 100644
index 0000000000..0c9cf01d94
--- /dev/null
+++ b/.changeset/strong-moose-work.md
@@ -0,0 +1,5 @@
+---
+'@backstage/repo-tools': minor
+---
+
+Add --additional-properties option to generate command to pass properties to @openapitools/openapi-generator-cli
diff --git a/packages/repo-tools/src/commands/index.ts b/packages/repo-tools/src/commands/index.ts
index 83266ea9f9..a07b01077f 100644
--- a/packages/repo-tools/src/commands/index.ts
+++ b/packages/repo-tools/src/commands/index.ts
@@ -54,6 +54,10 @@ function registerPackageCommand(program: Command) {
     .description(
       'Command to generate a client and/or a server stub from an OpenAPI spec.',
     )
+    .option('--additional-properties [properties]')
+    .description(
+      'Additional properties that can be passed to @openapitools/openapi-generator-cli',
+    )
     .action(
       lazy(() =>
         import('./package/schema/openapi/generate').then(m => m.command),
diff --git a/packages/repo-tools/src/commands/package/schema/openapi/generate/client.ts b/packages/repo-tools/src/commands/package/schema/openapi/generate/client.ts
index 6963e02664..1f4b2e5152 100644
--- a/packages/repo-tools/src/commands/package/schema/openapi/generate/client.ts
+++ b/packages/repo-tools/src/commands/package/schema/openapi/generate/client.ts
@@ -27,12 +27,18 @@ import { exec } from '../../../../../lib/exec';
 import { resolvePackagePath } from '@backstage/backend-plugin-api';
 import { getPathToCurrentOpenApiSpec } from '../../../../../lib/openapi/helpers';
 
-async function generate(outputDirectory: string) {
+async function generate(
+  outputDirectory: string,
+  additionalProperties?: string,
+) {
   const resolvedOpenapiPath = await getPathToCurrentOpenApiSpec();
   const resolvedOutputDirectory = cliPaths.resolveTargetRoot(
     outputDirectory,
     OUTPUT_PATH,
   );
+  const openapiProperties = additionalProperties
+    ? `--additional-properties=${additionalProperties}`
+    : '';
   mkdirpSync(resolvedOutputDirectory);
 
   await fs.mkdirp(resolvedOutputDirectory);
@@ -60,6 +66,7 @@ async function generate(outputDirectory: string) {
       ),
       '--generator-key',
       'v3.0',
+      openapiProperties,
     ],
     {
       maxBuffer: Number.MAX_VALUE,
@@ -87,9 +94,12 @@ async function generate(outputDirectory: string) {
   });
 }
 
-export async function command(outputPackage: string): Promise<void> {
+export async function command(
+  outputPackage: string,
+  additionalProperties?: string,
+): Promise<void> {
   try {
-    await generate(outputPackage);
+    await generate(outputPackage, additionalProperties);
     console.log(
       chalk.green(`Generated client in ${outputPackage}/${OUTPUT_PATH}`),
     );
diff --git a/packages/repo-tools/src/commands/package/schema/openapi/generate/index.ts b/packages/repo-tools/src/commands/package/schema/openapi/generate/index.ts
index 1e48fe3825..5356db3244 100644
--- a/packages/repo-tools/src/commands/package/schema/openapi/generate/index.ts
+++ b/packages/repo-tools/src/commands/package/schema/openapi/generate/index.ts
@@ -26,7 +26,7 @@ export async function command(opts: OptionValues) {
     process.exit(1);
   }
   if (opts.clientPackage) {
-    await generateClient(opts.clientPackage);
+    await generateClient(opts.clientPackage, opts.additionalProperties);
   }
   if (opts.server) {
     await generateServer();