diff --git a/.github/overcloud-host-image-build-path-filters.yml b/.github/overcloud-host-image-build-path-filters.yml
new file mode 100644
index 000000000..00d99bcb7
--- /dev/null
+++ b/.github/overcloud-host-image-build-path-filters.yml
@@ -0,0 +1,3 @@
+# This file is a list of path filters for the overcloud host image build workflow in .github/workflows/trigger-overcloud-host-image-build.yml.
+pulp-repo-versions: &pulp-repo-versions
+  - 'etc/kayobe/pulp-repo-versions.yml'
diff --git a/.github/path-filters.yml b/.github/stackhpc-pull-request-path-filters.yml
similarity index 100%
rename from .github/path-filters.yml
rename to .github/stackhpc-pull-request-path-filters.yml
diff --git a/.github/workflows/overcloud-host-image-build.yml b/.github/workflows/overcloud-host-image-build.yml
index 145cc3170..eae693084 100644
--- a/.github/workflows/overcloud-host-image-build.yml
+++ b/.github/workflows/overcloud-host-image-build.yml
@@ -44,7 +44,7 @@ jobs:
     runs-on: ${{ needs.runner-selection.outputs.runner_name_image_build }}
     needs:
       - runner-selection
-    permissions: {}
+    permissions: write-all
     steps:
       - name: Validate inputs
         run: |
@@ -56,7 +56,7 @@ jobs:
       - name: Install Package
         uses: ConorMacBride/install-package@main
         with:
-          apt: git unzip nodejs python3-pip python3-venv openssh-server openssh-client jq
+          apt: git unzip nodejs python3-pip python3-venv openssh-server openssh-client jq gh
 
       - name: Start the SSH service
         run: |
@@ -390,3 +390,41 @@ jobs:
           OS_APPLICATION_CREDENTIAL_ID: ${{ secrets.OS_APPLICATION_CREDENTIAL_ID }}
           OS_APPLICATION_CREDENTIAL_SECRET: ${{ secrets.OS_APPLICATION_CREDENTIAL_SECRET }}
         if: always()
+
+      - name: Trigger update overcloud host image tags
+        run: |
+          gh workflow run \
+          update-overcloud-host-image-tags.yml \
+          --repo stackhpc/stackhpc-kayobe-config \
+          --ref $BRANCH_NAME \
+          $(if [[ "${{ inputs.rocky9 }}" == "true" ]]; then echo "-f rocky9_tag=${{ steps.host_image_tag.outputs.host_image_tag }}"; fi) \
+          $(if [[ "${{ inputs.ubuntu-noble }}" == "true" ]]; then echo "-f ubuntu_noble_tag=${{ steps.host_image_tag.outputs.host_image_tag }}"; fi)
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+
+      - name: Display link to update overcloud host image tags workflows
+        run: |
+          echo "::notice Overcloud host image promote workflow: https://github.com/stackhpc/stackhpc-kayobe-config/actions/workflows/update-overcloud-host-image-tags.yml"
+
+      - name: Send message to Slack via Workflow Builder
+        uses: slackapi/slack-github-action@v1.26.0
+        with:
+          payload: |
+            {
+              "channel-id": "${{ env.SLACK_CHANNEL_ID }}",
+              "inputs": "${{ env.INPUTS }}",
+              "message": "${{ env.MESSAGE }}",
+              "results-url": "${{ env.RESULTS_URL }}",
+              "workflow-url": "${{ env.WORKFLOW_URL }}"
+            }
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+          # #release-train-alerts
+          SLACK_CHANNEL_ID: C03B28HRP53
+          INPUTS: >-
+            branch: ${{ github.ref_name }}
+          MESSAGE: "SKC overcloud host image build failed :sob:"
+          RESULTS_URL: "N/A"
+          WORKFLOW_URL: "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+        if: failure()
diff --git a/.github/workflows/overcloud-host-image-promote.yml b/.github/workflows/overcloud-host-image-promote.yml
index 960dbc0df..c73d68f94 100644
--- a/.github/workflows/overcloud-host-image-promote.yml
+++ b/.github/workflows/overcloud-host-image-promote.yml
@@ -11,10 +11,6 @@ on:
         description: Promote Ubuntu 24.04 Noble
         type: boolean
         default: true
-      image_tag:
-        description: Tag to promote
-        type: string
-        required: true
 env:
   ANSIBLE_FORCE_COLOR: True
 jobs:
@@ -81,7 +77,7 @@ jobs:
           -e os_distribution='rocky' \
           -e os_release='9'
         env:
-          ARTIFACT_TAG: ${{ inputs.image_tag }}
+          ARTIFACT_TAG: "{{ stackhpc_rocky_9_overcloud_host_image_version }}"
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
         if: inputs.rocky9
 
@@ -95,6 +91,6 @@ jobs:
           -e os_distribution='ubuntu' \
           -e os_release='noble'
         env:
-          ARTIFACT_TAG: ${{ inputs.image_tag }}
+          ARTIFACT_TAG: "{{ stackhpc_ubuntu_noble_overcloud_host_image_version }}"
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
         if: inputs.ubuntu-noble
diff --git a/.github/workflows/stackhpc-promote.yml b/.github/workflows/stackhpc-promote.yml
index 852462146..50cfef0ba 100644
--- a/.github/workflows/stackhpc-promote.yml
+++ b/.github/workflows/stackhpc-promote.yml
@@ -44,6 +44,20 @@ jobs:
         run: |
           echo "::notice Container image promote workflow: https://github.com/stackhpc/stackhpc-release-train/actions/workflows/container-promote.yml"
 
+      - name: Trigger overcloud host image promotion
+        run: |
+          gh workflow run \
+          overcloud-host-image-promote.yml \
+          --repo stackhpc/stackhpc-kayobe-config \
+          --ref $BRANCH_NAME
+        env:
+          GITHUB_TOKEN: ${{ secrets.STACKHPC_RELEASE_TRAIN_TOKEN }}
+          BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+
+      - name: Display link to overcloud host image promotion workflows
+        run: |
+          echo "::notice Overcloud host image promote workflow: https://github.com/stackhpc/stackhpc-kayobe-config/actions/workflows/overcloud-host-image-promote.yml"
+
       - name: Send message to Slack via Workflow Builder
         uses: slackapi/slack-github-action@v1.26.0
         with:
diff --git a/.github/workflows/stackhpc-pull-request.yml b/.github/workflows/stackhpc-pull-request.yml
index 5d71d0f74..37fcd1fc4 100644
--- a/.github/workflows/stackhpc-pull-request.yml
+++ b/.github/workflows/stackhpc-pull-request.yml
@@ -34,7 +34,7 @@ jobs:
         id: changes
         with:
           # Filters are defined in this file.
-          filters: .github/path-filters.yml
+          filters: .github/stackhpc-pull-request-path-filters.yml
 
   tox:
     runs-on: ubuntu-24.04
diff --git a/.github/workflows/trigger-overcloud-host-image-build.yml b/.github/workflows/trigger-overcloud-host-image-build.yml
new file mode 100644
index 000000000..dd7088197
--- /dev/null
+++ b/.github/workflows/trigger-overcloud-host-image-build.yml
@@ -0,0 +1,44 @@
+---
+name: Trigger overcloud host image build
+on:
+  push:
+    branches:
+      - stackhpc/2025.1
+
+jobs:
+  check-changes:
+    runs-on: ubuntu-24.04
+    name: Check changed files
+    if: github.repository == 'stackhpc/stackhpc-kayobe-config'
+    outputs:
+      pulp-repo-versions: ${{ steps.changes.outputs.pulp-repo-versions }}
+    steps:
+      - name: GitHub Checkout
+        uses: actions/checkout@v4
+
+      - name: Check changed files
+        uses: dorny/paths-filter@v3
+        id: changes
+        with:
+          filters: .github/overcloud-host-image-build-path-filters.yml
+
+  trigger-overcloud-host-image-build:
+    runs-on: ubuntu-24.04
+    name: Trigger overcloud host image build
+    needs:
+      - check-changes
+    if: ${{ needs.check-changes.outputs.pulp-repo-versions == 'true' }}
+    steps:
+      - name: Trigger overcloud host image build
+        run: |
+          gh workflow run \
+          overcloud-host-image-build.yml \
+          --repo stackhpc/stackhpc-kayobe-config \
+          --ref $BRANCH_NAME
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+
+      - name: Display link to overcloud host image build workflows
+        run: |
+          echo "::notice Overcloud host image build workflows: https://github.com/stackhpc/stackhpc-kayobe-config/actions/workflows/overcloud-host-image-build.yml"
diff --git a/.github/workflows/update-overcloud-host-image-tags.yml b/.github/workflows/update-overcloud-host-image-tags.yml
new file mode 100644
index 000000000..19c8780aa
--- /dev/null
+++ b/.github/workflows/update-overcloud-host-image-tags.yml
@@ -0,0 +1,56 @@
+---
+name: Update overcloud host image tags
+
+on:
+  workflow_dispatch:
+    inputs:
+      rocky9_tag:
+        description: Overcloud host image tag for Rocky 9
+        type: string
+      ubuntu_noble_tag:
+        description: Overcloud host image tag for Ubuntu
+        type: string
+
+jobs:
+  propose_overcloud_host_image_tag_updates:
+    if: github.repository == 'stackhpc/stackhpc-kayobe-config'
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: write
+      pull-requests: write
+    name: Update overcloud host image tags
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: stackhpc/2025.1
+          path: ${{ github.workspace }}/src/kayobe-config
+
+      - name: Update Rocky 9 overcloud host image tag
+        run: |
+          sed -i "/stackhpc_rocky_9_overcloud_host_image_version/s/.*/stackhpc_rocky_9_overcloud_host_image_version: ${{ inputs.rocky9_tag }}/" ${{ github.workspace }}/src/kayobe-config/etc/kayobe/pulp-host-image-versions.yml
+        if: "${{ inputs.rocky9_tag != '' }}"
+
+      - name: Update Ubuntu Noble overcloud host image tag
+        run: |
+          sed -i "/stackhpc_ubuntu_noble_overcloud_host_image_version/s/.*/stackhpc_ubuntu_noble_overcloud_host_image_version: ${{ inputs.ubuntu_noble_tag }}/" ${{ github.workspace }}/src/kayobe-config/etc/kayobe/pulp-host-image-versions.yml
+        if: "${{ inputs.ubuntu_noble_tag != '' }}"
+
+      - name: Propose changes via PR if required
+        uses: peter-evans/create-pull-request@v7
+        with:
+          path: ${{ github.workspace }}/src/kayobe-config
+          commit-message: >-
+            Bump overcloud host image tags
+          author: stackhpc-ci <22933334+stackhpc-ci@users.noreply.github.com>
+          branch: bump-overcloud-host-images-${{ inputs.rocky9_tag }}-${{ inputs.ubuntu_noble_tag }}
+          delete-branch: true
+          title: >-
+            DNM test PR: Bump overcloud host image tags 
+          body: |
+            This PR was created automatically to update the overcloud host image
+            tags.
+            Rocky 9: ${{ inputs.rocky9_tag }}
+            Ubuntu Noble: ${{ inputs.ubuntu_noble_tag }}
+          labels: |
+            automated
diff --git a/releasenotes/notes/automation-around-overcloud-host-images-1cb4ed5da1faee94.yaml b/releasenotes/notes/automation-around-overcloud-host-images-1cb4ed5da1faee94.yaml
new file mode 100644
index 000000000..64880f040
--- /dev/null
+++ b/releasenotes/notes/automation-around-overcloud-host-images-1cb4ed5da1faee94.yaml
@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    Overcloud host images will now automatically be built when changes to
+    ``pulp-repo-versions.yml`` are pushed to ``stackhpc/2025.1``. Once these
+    are built successfully, a PR will be automatically proposed back to SKC to
+    bump the image tags. These images will then be automatically promoted when
+    new host image tags are merged. If the overcloud host image build fails, an
+    alert will be sent to #release-train-alerts on Slack.