diff --git a/.github/workflows/team.yml b/.github/workflows/team.yml
new file mode 100644
index 000000000000..099ea882aa7c
--- /dev/null
+++ b/.github/workflows/team.yml
@@ -0,0 +1,81 @@
+name: Teams
+
+on:
+  schedule:
+    # Every Tuesday at 19:42 (randomly chosen)
+    - cron: '42 19 * * 1'
+
+  # Allows manual trigger
+  workflow_dispatch:
+
+permissions: {}
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  sync:
+    runs-on: ubuntu-24.04-arm
+    steps:
+      - uses: actions/create-github-app-token@67018539274d69449ef7c02e8e71183d1719ab42 # v2.1.4
+        id: team-token
+        with:
+          app-id: ${{ vars.OWNER_APP_ID }}
+          private-key: ${{ secrets.OWNER_APP_PRIVATE_KEY }}
+          permission-administration: read
+          permission-members: read
+      - name: Fetch source
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+          sparse-checkout: |
+            ci/github-script
+            maintainers/github-teams.json
+      - name: Install dependencies
+        run: npm install bottleneck
+      - name: Synchronise teams
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          github-token: ${{ steps.team-token.outputs.token }}
+          script: |
+            require('./ci/github-script/get-teams.js')({
+              github,
+              context,
+              core,
+              outFile: "maintainers/github-teams.json"
+            })
+
+      # Use a GitHub App to create the PR so that CI gets triggered
+      - uses: actions/create-github-app-token@67018539274d69449ef7c02e8e71183d1719ab42 # v2.1.4
+        id: sync-token
+        with:
+          app-id: ${{ vars.NIXPKGS_CI_APP_ID }}
+          private-key: ${{ secrets.NIXPKGS_CI_APP_PRIVATE_KEY }}
+          permission-contents: write
+          permission-pull-requests: write
+      - name: Get GitHub App User Git String
+        id: user
+        env:
+          GH_TOKEN: ${{ steps.sync-token.outputs.token }}
+          APP_SLUG: ${{ steps.sync-token.outputs.app-slug }}
+        run: |
+          name="${APP_SLUG}[bot]"
+          userId=$(gh api "/users/$name" --jq .id)
+          email="$userId+$name@users.noreply.github.com"
+          echo "git-string=$name <$email>" >> "$GITHUB_OUTPUT"
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e # v7.0.8
+        with:
+          token: ${{ steps.sync-token.outputs.token }}
+          add-paths: maintainers/github-teams.json
+          author: ${{ steps.user.outputs.git-string }}
+          committer: ${{ steps.user.outputs.git-string }}
+          commit-message: "maintainers/github-teams.json: Automated sync"
+          branch: github-team-sync
+          title: "maintainers/github-teams.json: Automated sync"
+          body: |
+            This is an automated PR to sync the GitHub teams with access to this repository to the `lib.teams` list.
+
+            This PR can be merged without taking any further action.
+
diff --git a/ci/github-script/get-teams.js b/ci/github-script/get-teams.js
new file mode 100755
index 000000000000..9b6d3333f91f
--- /dev/null
+++ b/ci/github-script/get-teams.js
@@ -0,0 +1,82 @@
+const excludeTeams = [
+  /^voters.*$/,
+  /^nixpkgs-maintainers$/,
+  /^nixpkgs-committers$/,
+]
+
+module.exports = async ({ github, context, core, outFile }) => {
+  const withRateLimit = require('./withRateLimit.js')
+  const { writeFileSync } = require('node:fs')
+  const result = {}
+  await withRateLimit({ github, core }, async (_stats) => {
+    /// Turn an Array of users into an Object, mapping user.login -> user.id
+    function makeUserSet(users) {
+      // Sort in-place and build result by mutation
+      users.sort((a, b) => (a.login > b.login ? 1 : -1))
+
+      return users.reduce((acc, user) => {
+        acc[user.login] = user.id
+        return acc
+      }, {})
+    }
+
+    /// Process a list of teams and append to the result variable
+    async function processTeams(teams) {
+      for (const team of teams) {
+        core.notice(`Processing team ${team.slug}`)
+        if (!excludeTeams.some((regex) => team.slug.match(regex))) {
+          const members = makeUserSet(
+            await github.paginate(github.rest.teams.listMembersInOrg, {
+              org: context.repo.owner,
+              team_slug: team.slug,
+              role: 'member',
+            }),
+          )
+          const maintainers = makeUserSet(
+            await github.paginate(github.rest.teams.listMembersInOrg, {
+              org: context.repo.owner,
+              team_slug: team.slug,
+              role: 'maintainer',
+            }),
+          )
+          result[team.slug] = {
+            description: team.description,
+            id: team.id,
+            maintainers,
+            members,
+            name: team.name,
+          }
+        }
+        await processTeams(
+          await github.paginate(github.rest.teams.listChildInOrg, {
+            org: context.repo.owner,
+            team_slug: team.slug,
+          }),
+        )
+      }
+    }
+
+    const teams = await github.paginate(github.rest.repos.listTeams, {
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+    })
+
+    await processTeams(teams)
+  })
+
+  // Sort the teams by team name
+  const sorted = Object.keys(result)
+    .sort()
+    .reduce((acc, key) => {
+      acc[key] = result[key]
+      return acc
+    }, {})
+
+  const json = `${JSON.stringify(sorted, null, 2)}\n`
+
+  if (outFile) {
+    writeFileSync(outFile, json)
+  } else {
+    console.log(json)
+  }
+}
diff --git a/ci/github-script/run b/ci/github-script/run
index 1d974cf5355f..2d5121b75b7e 100755
--- a/ci/github-script/run
+++ b/ci/github-script/run
@@ -83,4 +83,16 @@ program
     }
   })
 
+program
+  .command('get-teams')
+  .description('Fetch the list of teams with GitHub and output it to a file')
+  .argument('<owner>', 'Owner of the GitHub repository to label (Example: NixOS)')
+  .argument('<repo>', 'Name of the GitHub repository to label (Example: nixpkgs)')
+  .argument('[outFile]', 'Path to the output file (Example: github-teams.json). If not set, prints to stdout')
+  .action(async (owner, repo, outFile, options) => {
+    const getTeams = (await import('./get-teams.js')).default
+    // TODO: Refactor this file so we don't need to pass a PR
+    await run(getTeams, owner, repo, undefined, { ...options, outFile })
+  })
+
 await program.parse()