diff --git a/.github/actions/proxy/deploy-proxy/action.yaml b/.github/actions/proxy/deploy-proxy/action.yaml
index 9daf583..06a66c8 100644
--- a/.github/actions/proxy/deploy-proxy/action.yaml
+++ b/.github/actions/proxy/deploy-proxy/action.yaml
@@ -26,6 +26,10 @@ inputs:
   proxygen-environment:
     description: 'Proxygen environment'
     required: true
+  pr-number:
+    description: 'Pull request number. When provided, appends "(PR-<number>)" to the API title in the proxy specification to distinguish PR-based proxies in the developer portal.'
+    required: false
+    default: ""
 
 runs:
   using: composite
@@ -48,6 +52,14 @@ runs:
 
         yq eval '.x-nhsd-apim.target.url = env(TARGET_URL) | .x-nhsd-apim.target.security.secret = env(MTLS_SECRET_NAME)' -i /tmp/proxy-specification.yaml
 
+    - name: Append PR number to API title
+      if: ${{ inputs.pr-number != '' }}
+      env:
+        PR_NUMBER: "${{ inputs.pr-number }}"
+      shell: bash
+      run: |
+        yq eval '.info.title = .info.title + " (PR-" + env(PR_NUMBER) + ")"' -i /tmp/proxy-specification.yaml
+
     - name: Deploy API proxy
       env:
         ENVIRONMENT: "${{ inputs.proxygen-environment }}"
diff --git a/.github/workflows/preview-env.yaml b/.github/workflows/preview-env.yaml
index ca21e57..f1638f0 100644
--- a/.github/workflows/preview-env.yaml
+++ b/.github/workflows/preview-env.yaml
@@ -594,6 +594,7 @@ jobs:
           proxygen-client-id: ${{ env.PROXYGEN_CLIENT_ID }}
           proxygen-api-name: ${{ env.PROXYGEN_API_NAME }}
           proxygen-environment: ${{ env.PROXY_ENV}}
+          pr-number: ${{ github.event.pull_request.number }}
 
       - name: Deploy int preview API proxy
         if: github.event.action != 'closed' && github.event.pull_request.user.login != 'dependabot[bot]'
@@ -607,6 +608,7 @@ jobs:
           proxygen-client-id: ${{ env.PROXYGEN_CLIENT_ID }}
           proxygen-api-name: ${{ env.PROXYGEN_API_NAME }}
           proxygen-environment: ${{ env.PROXY_ENV}}
+          pr-number: "${{ github.event.pull_request.number }}i"
 
       - name: Tear down preview API proxy
         if: github.event.action == 'closed'