diff --git a/.github/actions/sync-project-status/README.md b/.github/actions/sync-project-status/README.md
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+# Sync Project Status
+
+A composite GitHub Action that keeps the `Status` field in sync for issues
+belonging to more than one org-level ProjectV2.
+
+## Explanation
+
+### What it does
+
+ProjectsV2 has no workflow trigger for field edits, so this runs as a
+scheduled batch job. For each issue (or PR) that is an item in two or more of
+the configured projects:
+
+- If statuses differ, the most recently updated `Status` wins (based on the
+  field value's `updatedAt`) and is copied to the other projects
+- Status option names are matched case-insensitively, so `In Progress` and
+  `In progress` count as already in sync
+- A status set in only one project propagates to projects where it's unset
+- Archived items, items in only one project, and items with no status
+  anywhere are ignored
+- A mismatch whose status name has no matching option in the target project
+  is logged as a warning and skipped
+
+The GraphQL/IO code lives in `src/projects.js`; the planning logic in
+`src/plan.js` is pure and side-effect free.
+
+### Why a GitHub App
+
+The default `GITHUB_TOKEN` cannot read or write org-level ProjectsV2. This
+action mints an installation token from a dedicated GitHub App, which needs:
+
+- Organization permissions: Projects read & write
+- Repository permissions: Issues read, Pull requests read
+
+## How-to guides
+
+### Run on a schedule (how this repo uses it)
+
+See [`sync-project-status.yml`](../../workflows/sync-project-status.yml):
+checkout this repo, assume a narrow OIDC role, fetch the app PEM from AWS
+Secrets Manager, then reference the action locally. The role, secret, and
+GitHub App are managed in `omf-github-terraform`.
+
+```yaml
+on:
+  schedule:
+    - cron: "17 */3 * * *"
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        type: boolean
+        default: false
+
+jobs:
+  sync:
+    runs-on: ubuntu-slim
+    permissions:
+      contents: read
+      id-token: write # for OIDC authentication with AWS
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+
+      - uses: aws-actions/configure-aws-credentials@v6
+        with:
+          aws-region: us-west-2
+          role-to-assume: arn:aws:iam::816069134238:role/gha-project-manager-secrets-reader
+
+      - uses: aws-actions/aws-secretsmanager-get-secrets@v3
+        with:
+          secret-ids: |
+            PROJECT_MANAGER_PEM, omf-github-terraform/project-manager/pem
+
+      - uses: ./.github/actions/sync-project-status
+        with:
+          clientId: "Iv23limfwiJlCIqHPHrd" # overture-project-manager app, not sensitive
+          privateKey: ${{ env.PROJECT_MANAGER_PEM }}
+          dryRun: ${{ inputs.dry_run || 'false' }}
+```
+
+### Dry run
+
+Trigger the workflow manually with `dry_run` checked, or pass
+`dryRun: "true"` to the action. Intended changes are logged but not applied.
+
+## Reference
+
+### Inputs
+
+- `clientId` (**required**): Client ID of the GitHub App used to mint the
+  installation token.
+- `privateKey` (**required**): Private key for the app. Must come from an
+  already-masked source (a GitHub Actions secret, or
+  `aws-actions/aws-secretsmanager-get-secrets` as this repo does): the
+  action re-masks the value line-by-line as defense in depth, but it cannot
+  mask the value's handling before it arrives as an input. Include the full
+  PEM block with a trailing newline.
+- `projectNumbers` (optional): Comma-separated org project numbers to sync.
+  Defaults to `84,78,54` (Overture, places-surge, CloudDevOps).
+- `dryRun` (optional): `"true"` to log intended changes without applying
+  them. Defaults to `"false"`.
+
+### Outputs
+
+This action has no outputs. Results are logged, with a summary notice at the
+end.
+
+### Conflict resolution
+
+Last write wins: whichever project's `Status` was edited most recently is the
+source of truth for that item on each run. Between runs, conflicting edits in
+different projects are resolved in favor of the later edit.
diff --git a/.github/actions/sync-project-status/action.yml b/.github/actions/sync-project-status/action.yml
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+++ b/.github/actions/sync-project-status/action.yml
@@ -0,0 +1,87 @@
+---
+name: Sync Project Status
+description: >
+  Keeps the Status field in sync for issues that belong to more than one
+  org-level ProjectV2. For each issue in multiple projects with mismatched
+  statuses, the most recently updated Status wins and is copied to the
+  others. Option names are matched case-insensitively.
+
+inputs:
+  projectNumbers:
+    # A project's number is in its URL: github.com/orgs/OvertureMaps/projects/<number>.
+    # The app must also be granted access to it in the org's app installation settings.
+    description: Comma-separated org project numbers to sync
+    required: false
+    default: "84,78,54" # Overture, places-surge, CloudDevOps
+  dryRun:
+    description: Log intended changes without applying them
+    required: false
+    default: "false"
+  clientId:
+    description: >
+      GitHub App client ID used to generate an installation token with
+      org-level Projects read & write access. The default GITHUB_TOKEN
+      cannot read or write org ProjectsV2.
+    required: true
+  privateKey:
+    description: >
+      GitHub App private key. Must come from an already-masked source: a
+      GitHub Actions secret or aws-actions/aws-secretsmanager-get-secrets
+      (both register masks at fetch time). This action re-masks the value
+      as defense in depth, but that cannot cover the value's handling
+      before it reaches this action.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Mask private key
+      shell: bash
+      run: |
+        echo "::group::Masking private key"
+        # Defense in depth only: the PEM already crossed a step boundary as
+        # an input, so the caller's source must register its own masks
+        # (GitHub secrets and aws-secretsmanager-get-secrets both do).
+        # Line-by-line because a single ::add-mask:: on a multi-line value
+        # only registers the first line.
+        while IFS= read -r line; do
+          [ -n "$line" ] && echo "::add-mask::$line"
+        done <<< "$INPUTS_PRIVATEKEY"
+        echo "::endgroup::"
+      env:
+        INPUTS_PRIVATEKEY: ${{ inputs.privateKey }}
+
+    - name: Generate GitHub App token
+      id: app-token
+      uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0 # zizmor: ignore[github-app,ref-version-mismatch] -- dedicated app scoped to org project sync
+      with:
+        client-id: ${{ inputs.clientId }}
+        private-key: ${{ inputs.privateKey }}
+        owner: ${{ github.repository_owner }} # zizmor: ignore[github-app] -- org-level project access is the point
+
+    - name: Sync project statuses
+      uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+      env:
+        PROJECT_NUMBERS: ${{ inputs.projectNumbers }}
+        DRY_RUN: ${{ inputs.dryRun }}
+      with:
+        github-token: ${{ steps.app-token.outputs.token }}
+        script: |
+          const path = require('path');
+          const run = require(path.join(process.env.GITHUB_ACTION_PATH, 'src', 'index.js'));
+          const projectNumbers = process.env.PROJECT_NUMBERS
+            .split(',')
+            .map((s) => s.trim())
+            .filter(Boolean)
+            .map(Number);
+          if (projectNumbers.length < 2 || projectNumbers.some((n) => !Number.isInteger(n) || n <= 0)) {
+            core.setFailed(`projectNumbers must be 2+ comma-separated positive integers, got "${process.env.PROJECT_NUMBERS}"`);
+            return;
+          }
+          await run({
+            github,
+            core,
+            org: context.repo.owner,
+            projectNumbers,
+            dryRun: process.env.DRY_RUN === 'true',
+          });
diff --git a/.github/actions/sync-project-status/src/index.js b/.github/actions/sync-project-status/src/index.js
new file mode 100644
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--- /dev/null
+++ b/.github/actions/sync-project-status/src/index.js
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+// Entry point: fetch projects, plan the sync, apply (or log, in dry-run).
+'use strict';
+
+const { fetchProject, applyChange } = require('./projects.js');
+const { buildPlan } = require('./plan.js');
+
+module.exports = async function run({ github, core, org, projectNumbers, dryRun }) {
+  const projects = await Promise.all(projectNumbers.map((n) => fetchProject(github, org, n)));
+
+  for (const p of projects) {
+    if (!p.statusField?.options?.length) {
+      core.setFailed(`Project "${p.title}" (#${p.number}) has no Status single-select field.`);
+      return;
+    }
+    core.info(`Project "${p.title}" (#${p.number}): ${p.items.length} items`);
+  }
+
+  const { changes, skipped } = buildPlan(projects);
+
+  for (const s of skipped) {
+    core.warning(
+      `${s.ref}: project "${s.projectTitle}" has no Status option matching "${s.sourceStatus}", skipping.`
+    );
+  }
+
+  for (const change of changes) {
+    const action = dryRun ? 'would set' : 'setting';
+    core.info(
+      `${change.ref}: ${action} "${change.projectTitle}" status ` +
+        `"${change.currentStatus ?? '(unset)'}" -> "${change.newStatus}" ` +
+        `(source: "${change.sourceTitle}")`
+    );
+    if (!dryRun) {
+      await applyChange(github, change);
+    }
+  }
+
+  core.notice(
+    `Done: ${changes.length + skipped.length} mismatches found, ` +
+      `${changes.length} ${dryRun ? 'would be ' : ''}synced, ` +
+      `${skipped.length} skipped (no matching option).`
+  );
+};
diff --git a/.github/actions/sync-project-status/src/plan.js b/.github/actions/sync-project-status/src/plan.js
new file mode 100644
index 0000000..61bf4d3
--- /dev/null
+++ b/.github/actions/sync-project-status/src/plan.js
@@ -0,0 +1,80 @@
+// Pure planning logic: given fetched projects, compute the status changes
+// needed to bring shared items in sync. No IO here, so it's unit-testable.
+'use strict';
+
+// Groups project items by their issue/PR node ID.
+function groupByContent(projects) {
+  const byContent = new Map();
+  for (const project of projects) {
+    for (const item of project.items) {
+      const entry = byContent.get(item.content.id) ?? { content: item.content, items: [] };
+      entry.items.push({ project, item });
+      byContent.set(item.content.id, entry);
+    }
+  }
+  return byContent;
+}
+
+// Picks the sync source for one shared item: the project entry whose Status
+// was updated most recently. Returns null when no project has a status set.
+function pickSource(entries) {
+  return (
+    entries
+      .filter((e) => e.item.fieldValueByName?.updatedAt)
+      .sort(
+        (a, b) =>
+          new Date(b.item.fieldValueByName.updatedAt) - new Date(a.item.fieldValueByName.updatedAt)
+      )[0] ?? null
+  );
+}
+
+// Computes the changes needed to sync statuses across projects.
+// Returns { changes, skipped } where changes are ready to apply and skipped
+// are mismatches with no matching Status option in the target project.
+function buildPlan(projects) {
+  const changes = [];
+  const skipped = [];
+
+  for (const { content, items } of groupByContent(projects).values()) {
+    if (items.length < 2) continue;
+
+    const source = pickSource(items);
+    if (!source) continue;
+
+    const sourceStatus = source.item.fieldValueByName.name;
+    const ref = `${content.repository.nameWithOwner}#${content.number}`;
+
+    for (const target of items) {
+      if (target === source) continue;
+      const current = target.item.fieldValueByName?.name;
+      if (current?.toLowerCase() === sourceStatus.toLowerCase()) continue;
+
+      const option = target.project.statusField.options.find(
+        (o) => o.name.toLowerCase() === sourceStatus.toLowerCase()
+      );
+      const base = {
+        ref,
+        projectTitle: target.project.title,
+        sourceTitle: source.project.title,
+        currentStatus: current ?? null,
+        sourceStatus,
+      };
+      if (!option) {
+        skipped.push(base);
+        continue;
+      }
+      changes.push({
+        ...base,
+        newStatus: option.name,
+        projectId: target.project.id,
+        itemId: target.item.id,
+        fieldId: target.project.statusField.id,
+        optionId: option.id,
+      });
+    }
+  }
+
+  return { changes, skipped };
+}
+
+module.exports = { buildPlan, groupByContent, pickSource };
diff --git a/.github/actions/sync-project-status/src/projects.js b/.github/actions/sync-project-status/src/projects.js
new file mode 100644
index 0000000..add0f53
--- /dev/null
+++ b/.github/actions/sync-project-status/src/projects.js
@@ -0,0 +1,76 @@
+// GraphQL access for org ProjectsV2: fetching projects/items and applying
+// status changes. All IO lives here; planning logic is in plan.js.
+'use strict';
+
+const PROJECT_QUERY = `
+  query($org: String!, $number: Int!, $cursor: String) {
+    organization(login: $org) {
+      projectV2(number: $number) {
+        id
+        title
+        field(name: "Status") {
+          ... on ProjectV2SingleSelectField {
+            id
+            options { id name }
+          }
+        }
+        items(first: 100, after: $cursor) {
+          pageInfo { hasNextPage endCursor }
+          nodes {
+            id
+            isArchived
+            content {
+              ... on Issue { id number repository { nameWithOwner } }
+              ... on PullRequest { id number repository { nameWithOwner } }
+            }
+            fieldValueByName(name: "Status") {
+              ... on ProjectV2ItemFieldSingleSelectValue {
+                name
+                optionId
+                updatedAt
+              }
+            }
+          }
+        }
+      }
+    }
+  }`;
+
+const UPDATE_STATUS_MUTATION = `
+  mutation($projectId: ID!, $itemId: ID!, $fieldId: ID!, $optionId: String!) {
+    updateProjectV2ItemFieldValue(input: {
+      projectId: $projectId
+      itemId: $itemId
+      fieldId: $fieldId
+      value: { singleSelectOptionId: $optionId }
+    }) { clientMutationId }
+  }`;
+
+// Fetches a project's Status field and all non-archived issue/PR items with
+// their current Status value and when it was last set.
+async function fetchProject(github, org, number) {
+  const project = { number, items: [] };
+  let cursor = null;
+  do {
+    const result = await github.graphql(PROJECT_QUERY, { org, number, cursor });
+    const p = result.organization.projectV2;
+    project.id = p.id;
+    project.title = p.title;
+    project.statusField = p.field;
+    project.items.push(...p.items.nodes.filter((n) => n && !n.isArchived && n.content?.id));
+    cursor = p.items.pageInfo.hasNextPage ? p.items.pageInfo.endCursor : null;
+  } while (cursor);
+  return project;
+}
+
+// Applies a single planned status change.
+async function applyChange(github, change) {
+  await github.graphql(UPDATE_STATUS_MUTATION, {
+    projectId: change.projectId,
+    itemId: change.itemId,
+    fieldId: change.fieldId,
+    optionId: change.optionId,
+  });
+}
+
+module.exports = { fetchProject, applyChange };
diff --git a/.github/workflows/sync-project-status.yml b/.github/workflows/sync-project-status.yml
new file mode 100644
index 0000000..c058883
--- /dev/null
+++ b/.github/workflows/sync-project-status.yml
@@ -0,0 +1,71 @@
+---
+# Keeps the Status field in sync for issues that belong to more than one
+# Overture ProjectV2 (currently Overture #84, places-surge #78, and
+# CloudDevOps #54).
+#
+# ProjectsV2 has no workflow trigger for field edits, so this runs as a
+# scheduled batch job. Sync logic lives in .github/actions/sync-project-status;
+# see its README for behavior and conflict resolution details.
+#
+# Auth: assumes a narrow OIDC role that can only read the
+# overture-project-manager GH App PEM from Secrets Manager. The role,
+# secret, and app are managed in omf-github-terraform.
+#
+name: Sync Project Status
+
+on:
+  schedule:
+    - cron: "17 */3 * * *"
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: "Log intended changes without applying them"
+        required: false
+        type: boolean
+        default: false
+
+permissions:
+  contents: read # to check out the sync action
+
+concurrency:
+  group: sync-project-status
+  cancel-in-progress: false
+
+jobs:
+  sync:
+    name: Sync statuses
+    runs-on: ubuntu-slim
+    permissions:
+      contents: read
+      id-token: write # for OIDC authentication with AWS
+    env:
+      # Client ID of the org's overture-project-manager GitHub App (not sensitive).
+      PROJECT_MANAGER_APP_CLIENT_ID: "Iv23limfwiJlCIqHPHrd"
+      # Narrow OIDC role (omf-github-terraform oidc-aws.tf) that can only
+      # read the project-manager PEM secret.
+      PROJECT_MANAGER_OIDC_ROLE_ARN: arn:aws:iam::816069134238:role/gha-project-manager-secrets-reader
+      PROJECT_MANAGER_PEM_SECRET_ID: omf-github-terraform/project-manager/pem
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+          sparse-checkout: .github/actions/sync-project-status
+
+      - uses: aws-actions/configure-aws-credentials@517a711dbcd0e402f90c77e7e2f81e849156e31d # v6.2.2
+        with:
+          aws-region: us-west-2
+          role-to-assume: ${{ env.PROJECT_MANAGER_OIDC_ROLE_ARN }}
+
+      # Exports the PEM as env.PROJECT_MANAGER_PEM, masked (incl. multi-line).
+      - name: Fetch project-manager PEM from Secrets Manager
+        uses: aws-actions/aws-secretsmanager-get-secrets@2cb1a461cbd4865ac4299648312e4704c646cd53 # v3.0.1
+        with:
+          secret-ids: |
+            PROJECT_MANAGER_PEM,${{ env.PROJECT_MANAGER_PEM_SECRET_ID }}
+
+      - name: Sync project statuses
+        uses: ./.github/actions/sync-project-status
+        with:
+          clientId: ${{ env.PROJECT_MANAGER_APP_CLIENT_ID }}
+          privateKey: ${{ env.PROJECT_MANAGER_PEM }}
+          dryRun: ${{ inputs.dry_run || 'false' }}