diff --git a/.changeset/tall-ducks-join.md b/.changeset/tall-ducks-join.md
new file mode 100644
index 000000000..1ed438b14
--- /dev/null
+++ b/.changeset/tall-ducks-join.md
@@ -0,0 +1,5 @@
+---
+'@roadiehq/scaffolder-backend-module-utils': minor
+---
+
+Add merge array value option
diff --git a/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.test.ts b/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.test.ts
index ba08a7177..ab47c9bf1 100644
--- a/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.test.ts
+++ b/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.test.ts
@@ -88,7 +88,8 @@ describe('roadiehq:utils:json:merge', () => {
   it('should append the content to the file if it already exists', async () => {
     mock({
       'fake-tmp-dir': {
-        'fake-file.json': '{ "scripts": { "lsltr": "ls -ltr" } }',
+        'fake-file.json':
+          '{ "scripts": { "lsltr": "ls -ltr" }, "array": ["first item"] }',
       },
     });
 
@@ -101,6 +102,7 @@ describe('roadiehq:utils:json:merge', () => {
           scripts: {
             lsltrh: 'ls -ltrh',
           },
+          array: ['second item'],
         },
       },
     });
@@ -109,6 +111,41 @@ describe('roadiehq:utils:json:merge', () => {
     const file = fs.readFileSync('fake-tmp-dir/fake-file.json', 'utf-8');
     expect(JSON.parse(file)).toEqual({
       scripts: { lsltr: 'ls -ltr', lsltrh: 'ls -ltrh' },
+      array: ['second item'],
+    });
+  });
+
+  it('should merge arrays if configured', async () => {
+    mock({
+      'fake-tmp-dir': {
+        'fake-file.json':
+          '{ "scripts": { "lsltr": "ls -ltr" }, "array": ["first item"] }',
+      },
+    });
+
+    await action.handler({
+      ...mockContext,
+      workspacePath: 'fake-tmp-dir',
+      input: {
+        path: 'fake-file.json',
+        mergeArrays: true,
+        content: {
+          scripts: {
+            lsltrh: 'ls -ltrh',
+          },
+          array: ['second item'],
+        },
+      },
+    });
+
+    expect(fs.existsSync('fake-tmp-dir/fake-file.json')).toBe(true);
+    const file = fs.readFileSync('fake-tmp-dir/fake-file.json', 'utf-8');
+    expect(JSON.parse(file)).toEqual({
+      scripts: {
+        lsltr: 'ls -ltr',
+        lsltrh: 'ls -ltrh',
+      },
+      array: ['first item', 'second item'],
     });
   });
 
@@ -277,7 +314,7 @@ scripts:
   it('can merge content into a yaml file', async () => {
     mock({
       'fake-tmp-dir': {
-        'fake-file.yaml': 'scripts:\n  lsltr: ls -ltr\n',
+        'fake-file.yaml': 'array: ["first item"]\nscripts:\n  lsltr: ls -ltr\n',
       },
     });
 
@@ -290,6 +327,7 @@ scripts:
           scripts: {
             lsltrh: 'ls -ltrh',
           },
+          array: ['second item'],
         },
       },
     });
@@ -298,6 +336,33 @@ scripts:
     const file = fs.readFileSync('fake-tmp-dir/fake-file.yaml', 'utf-8');
     expect(yaml.load(file)).toEqual({
       scripts: { lsltr: 'ls -ltr', lsltrh: 'ls -ltrh' },
+      array: ['second item'],
+    });
+  });
+
+  it('can merge arrays if configured', async () => {
+    mock({
+      'fake-tmp-dir': {
+        'fake-file.yaml': "array: ['first item']",
+      },
+    });
+
+    await action.handler({
+      ...mockContext,
+      workspacePath: 'fake-tmp-dir',
+      input: {
+        path: 'fake-file.yaml',
+        mergeArrays: true,
+        content: {
+          array: ['second item'],
+        },
+      },
+    });
+
+    expect(fs.existsSync('fake-tmp-dir/fake-file.yaml')).toBe(true);
+    const file = fs.readFileSync('fake-tmp-dir/fake-file.yaml', 'utf-8');
+    expect(yaml.load(file)).toEqual({
+      array: ['first item', 'second item'],
     });
   });
 
diff --git a/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.ts b/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.ts
index b6616771a..b005b9cc7 100644
--- a/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.ts
+++ b/plugins/scaffolder-actions/scaffolder-backend-module-utils/src/actions/merge/merge.ts
@@ -18,12 +18,23 @@ import { createTemplateAction } from '@backstage/plugin-scaffolder-node';
 import { resolveSafeChildPath } from '@backstage/backend-common';
 import fs from 'fs-extra';
 import { extname } from 'path';
-import { merge } from 'lodash';
+import { isArray, isNull, mergeWith } from 'lodash';
 import yaml from 'js-yaml';
 import { supportedDumpOptions, yamlOptionsSchema } from '../../types';
 
+function mergeArrayCustomiser(objValue: string | any[], srcValue: any) {
+  if (isArray(objValue) && !isNull(objValue)) {
+    return Array.from(new Set(objValue.concat(srcValue)));
+  }
+  return undefined;
+}
+
 export function createMergeJSONAction({ actionId }: { actionId?: string }) {
-  return createTemplateAction<{ path: string; content: any }>({
+  return createTemplateAction<{
+    path: string;
+    content: any;
+    mergeArrays?: boolean;
+  }>({
     id: actionId || 'roadiehq:utils:json:merge',
     description: 'Merge new data into an existing JSON file.',
     supportsDryRun: true,
@@ -43,6 +54,13 @@ export function createMergeJSONAction({ actionId }: { actionId?: string }) {
             title: 'Content',
             type: ['string', 'object'],
           },
+          mergeArrays: {
+            type: 'boolean',
+            default: false,
+            title: 'Merge Arrays?',
+            description:
+              'Where a value is an array the merge function should concatenate the provided array value with the target array',
+          },
         },
       },
       output: {
@@ -80,7 +98,15 @@ export function createMergeJSONAction({ actionId }: { actionId?: string }) {
 
       fs.writeFileSync(
         sourceFilepath,
-        JSON.stringify(merge(existingContent, content), null, 2),
+        JSON.stringify(
+          mergeWith(
+            existingContent,
+            content,
+            ctx.input.mergeArrays ? mergeArrayCustomiser : undefined,
+          ),
+          null,
+          2,
+        ),
       );
       ctx.output('path', sourceFilepath);
     },
@@ -91,6 +117,7 @@ export function createMergeAction() {
   return createTemplateAction<{
     path: string;
     content: any;
+    mergeArrays?: boolean;
     options?: supportedDumpOptions;
   }>({
     id: 'roadiehq:utils:merge',
@@ -112,6 +139,13 @@ export function createMergeAction() {
             title: 'Content',
             type: ['string', 'object'],
           },
+          mergeArrays: {
+            type: 'boolean',
+            default: false,
+            title: 'Merge Arrays?',
+            description:
+              'Where a value is an array the merge function should concatenate the provided array value with the target array',
+          },
           options: {
             ...yamlOptionsSchema,
             description: `${yamlOptionsSchema.description}  (for YAML output only)`,
@@ -148,7 +182,11 @@ export function createMergeAction() {
               ? JSON.parse(ctx.input.content)
               : ctx.input.content; // This supports the case where dynamic keys are required
           mergedContent = JSON.stringify(
-            merge(JSON.parse(originalContent), newContent),
+            mergeWith(
+              yaml.load(originalContent),
+              newContent,
+              ctx.input.mergeArrays ? mergeArrayCustomiser : undefined,
+            ),
             null,
             2,
           );
@@ -161,7 +199,11 @@ export function createMergeAction() {
               ? yaml.load(ctx.input.content)
               : ctx.input.content; // This supports the case where dynamic keys are required
           mergedContent = yaml.dump(
-            merge(yaml.load(originalContent), newContent),
+            mergeWith(
+              yaml.load(originalContent),
+              newContent,
+              ctx.input.mergeArrays ? mergeArrayCustomiser : undefined,
+            ),
             ctx.input.options,
           );
           break;