diff --git a/changelog.d/20230125_122634_nedbat_add_prs_to_projects_221.rst b/changelog.d/20230125_122634_nedbat_add_prs_to_projects_221.rst
new file mode 100644
index 00000000..457dcd38
--- /dev/null
+++ b/changelog.d/20230125_122634_nedbat_add_prs_to_projects_221.rst
@@ -0,0 +1,5 @@
+.. A new scriv changelog fragment.
+
+- Added: contribution pull requests will be added to GitHub projects if the
+  base repo says to by adding an "openedx.org/add-to-projects" annotation in
+  its catalog-info.yaml file.
diff --git a/docs/details.rst b/docs/details.rst
index 9ef45f97..75648ed7 100644
--- a/docs/details.rst
+++ b/docs/details.rst
@@ -154,3 +154,31 @@ When a pull request is re-opened
 The bot deletes the "please complete a survey" comment that was added when the
 pull request was closed.  The Jira issue is returned to the state it was in
 when the pull request was closed.
+
+
+Adding pull requests to GitHub projects
+---------------------------------------
+
+The bot will add new pull requests to GitHub projects.  Projects are specified
+with a string like "openedx:23" meaning `project number 23`_ in the openedx
+organization.
+
+.. _project number 23: https://github.com/orgs/openedx/projects/23
+
+- Regular non-internal pull requests get added to the project specified in the
+  GITHUB_OSPR_PROJECT setting.
+
+- Blended pull requests get added to the project specified in the
+  GITHUB_BLENDED_PROJECT setting.
+
+- Individual repos can specify other projects that external non-draft pull
+  requests should be added to.  The projects are listed in an annotation in
+  their catalog-info.yaml file:
+
+  .. code-block:: yaml
+
+      annotations:
+        # This can be multiple comma-separated projects.
+        openedx.org/add-to-projects: "openedx:23"
+
+The bot never removes pull requests from projects.
diff --git a/openedx_webhooks/info.py b/openedx_webhooks/info.py
index 441ba6f3..d21521ff 100644
--- a/openedx_webhooks/info.py
+++ b/openedx_webhooks/info.py
@@ -8,12 +8,13 @@
 from typing import Dict, Iterable, Optional, Tuple, Union
 
 import yaml
+from glom import glom
 from iso8601 import parse_date
 
 from openedx_webhooks import settings
 from openedx_webhooks.lib.github.models import PrId
 from openedx_webhooks.oauth import get_github_session
-from openedx_webhooks.types import PrDict, PrCommentDict
+from openedx_webhooks.types import GhProject, PrDict, PrCommentDict
 from openedx_webhooks.utils import (
     memoize,
     memoize_timed,
@@ -357,3 +358,38 @@ def jira_project_for_blended(pr: PrDict) -> Optional[str]:
     if settings.JIRA_SERVER is None:
         return None
     return "BLENDED"
+
+
+def get_catalog_info(repo_fullname: str) -> Dict:
+    """Get the parsed catalog-info.yaml data from a repo, or {} if missing."""
+    yml = _read_github_file(repo_fullname, "catalog-info.yaml", not_there="{}")
+    return yaml.safe_load(yml)
+
+
+def projects_for_pr(pull_request: PrDict) -> Iterable[GhProject]:
+    """
+    Get the projects a pull request should be added to.
+
+    Draft pull requests don't get added.
+
+    The projects are specified in an annotation in catalog-info.yaml::
+
+        metadata:
+          annotations:
+            openedx.org/add-to-projects: "openedx:23, openedx:456"
+
+    Each entry is an org:num spec for an organization project.
+
+    """
+    if is_draft_pull_request(pull_request):
+        return set()
+
+    catalog_info = get_catalog_info(pull_request["base"]["repo"]["full_name"])
+    annotations = glom(catalog_info, "metadata.annotations", default={})
+    projects = annotations.get("openedx.org/add-to-projects", "")
+    gh_projects = []
+    if projects:
+        for spec in projects.split(","):
+            org, number = spec.strip().split(":")
+            gh_projects.append((org, int(number)))
+    return gh_projects
diff --git a/openedx_webhooks/tasks/pr_tracking.py b/openedx_webhooks/tasks/pr_tracking.py
index 93c33549..ca5e8a40 100644
--- a/openedx_webhooks/tasks/pr_tracking.py
+++ b/openedx_webhooks/tasks/pr_tracking.py
@@ -10,8 +10,6 @@
 from dataclasses import dataclass, field
 from typing import Any, Dict, List, Optional, Set, Tuple, cast
 
-from glom import glom
-
 from openedx_webhooks import settings
 from openedx_webhooks.bot_comments import (
     BOT_COMMENT_INDICATORS,
@@ -49,6 +47,7 @@
     is_private_repo_no_cla_pull_request,
     jira_project_for_blended,
     jira_project_for_ospr,
+    projects_for_pr,
     pull_request_has_cla,
 )
 from openedx_webhooks.labels import (
@@ -299,6 +298,8 @@ def desired_support_state(pr: PrDict) -> Optional[PrDesiredInfo]:
         assert settings.GITHUB_OSPR_PROJECT, "You must set GITHUB_OSPR_PROJECT"
         desired.github_projects.add(settings.GITHUB_OSPR_PROJECT)
 
+    desired.github_projects.update(projects_for_pr(pr))
+
     has_signed_agreement = pull_request_has_cla(pr)
     if is_bot:
         desired.cla_check = CLA_STATUS_BOT
diff --git a/tests/repo_data/anotherorg/multi-project/catalog-info.yaml b/tests/repo_data/anotherorg/multi-project/catalog-info.yaml
new file mode 100644
index 00000000..b2a20a6b
--- /dev/null
+++ b/tests/repo_data/anotherorg/multi-project/catalog-info.yaml
@@ -0,0 +1,11 @@
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: 'Multi-project'
+  description: 'Some other thing'
+  annotations:
+    openedx.org/add-to-projects: "openedx:23, anotherorg:17"
+spec:
+  type: 'service'
+  lifecycle: 'production'
+  owner: someone-else
diff --git a/tests/repo_data/openedx/credentials/catalog-info.yaml b/tests/repo_data/openedx/credentials/catalog-info.yaml
new file mode 100644
index 00000000..00df470c
--- /dev/null
+++ b/tests/repo_data/openedx/credentials/catalog-info.yaml
@@ -0,0 +1,22 @@
+# This file records information about this repo. Its use is described in OEP-55:
+# https://open-edx-proposals.readthedocs.io/en/latest/processes/oep-0055-proc-project-maintainers.html
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: 'Credentials'
+  description: 'The Open edX Credentials Service, which supports course and program certificates.'
+  links:
+    - url: 'https://edx-credentials.readthedocs.io/'
+      title: 'Documentation'
+      icon: 'Article'
+  annotations:
+    # (Optional) Annotation keys and values can be whatever you want.
+    # We use it in Open edX repos to have a comma-separated list of GitHub user
+    # names that might be interested in changes to the architecture of this
+    # component.
+    openedx.org/arch-interest-groups: ""
+    openedx.org/add-to-projects: "openedx:23"
+spec:
+  type: 'service'
+  lifecycle: 'production'
+  owner: 2U-aperture
diff --git a/tests/repo_data/openedx/edx-platform/catalog-info.yaml b/tests/repo_data/openedx/edx-platform/catalog-info.yaml
new file mode 100644
index 00000000..bb1f294c
--- /dev/null
+++ b/tests/repo_data/openedx/edx-platform/catalog-info.yaml
@@ -0,0 +1,14 @@
+# This file records information about this repo. Its use is described in OEP-55:
+# https://open-edx-proposals.readthedocs.io/en/latest/processes/oep-0055-proc-project-maintainers.html
+
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: 'edx-platform'
+  description: "the original ball of mud"
+  annotations:
+    openedx.org/arch-interest-groups: ""
+spec:
+  owner: group:arch-bom
+  type: 'service'
+  lifecycle: 'production'
diff --git a/tests/test_pull_request_opened.py b/tests/test_pull_request_opened.py
index 22fafdaf..cb1a2107 100644
--- a/tests/test_pull_request_opened.py
+++ b/tests/test_pull_request_opened.py
@@ -901,3 +901,29 @@ def test_extra_fields_are_ok(fake_github, fake_jira):
     assert len(pr.list_comments()) == 1
     # The issue should still have the ad-hoc label.
     assert "my-label" in issue.labels
+
+
+def test_dont_add_internal_prs_to_project(fake_github, fake_jira):
+    pr = fake_github.make_pull_request(owner="openedx", repo="credentials", user="nedbat")
+    pull_request_changed(pr.as_json())
+    assert pull_request_projects(pr.as_json()) == set()
+
+
+def test_add_external_prs_to_project(fake_github, fake_jira):
+    pr = fake_github.make_pull_request(owner="openedx", repo="credentials", user="tusbar")
+    pull_request_changed(pr.as_json())
+    assert pull_request_projects(pr.as_json()) == {settings.GITHUB_OSPR_PROJECT, ("openedx", 23)}
+
+
+def test_dont_add_draft_prs_to_project(fake_github, fake_jira):
+    pr = fake_github.make_pull_request(owner="openedx", repo="credentials", user="tusbar", draft=True)
+    pull_request_changed(pr.as_json())
+    assert pull_request_projects(pr.as_json()) == {settings.GITHUB_OSPR_PROJECT}
+
+
+def test_add_to_multiple_projects(fake_github, fake_jira):
+    pr = fake_github.make_pull_request(owner="anotherorg", repo="multi-project", user="tusbar")
+    pull_request_changed(pr.as_json())
+    assert pull_request_projects(pr.as_json()) == {
+        settings.GITHUB_OSPR_PROJECT, ("openedx", 23), ("anotherorg", 17),
+    }