diff --git a/.github/workflows/tag-boost-milestone.yml b/.github/workflows/tag-boost-milestone.yml
new file mode 100644
index 0000000000000..c5b3f594c7584
--- /dev/null
+++ b/.github/workflows/tag-boost-milestone.yml
@@ -0,0 +1,44 @@
+name: Tag Boost PRs with milestone
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  tag-pr:
+    runs-on: ubuntu-latest
+    if: |
+      github.event.pull_request.merged == true &&
+      contains(github.event.pull_request.labels.*.name, '[Plugin] Boost')
+    env:
+      MILESTONE_NAME: "boost/next"
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Create the milestone if it doesn't exist
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        REPO: ${{ github.repository }}
+      run: |
+        if ! gh api repos/${REPO}/milestones --jq '.[] | select(.title=="'"$MILESTONE_NAME"'")' | grep -q "$MILESTONE_NAME"; then
+          echo "Creating milestone $MILESTONE_NAME"
+          gh api repos/${REPO}/milestones -F title="$MILESTONE_NAME" -F state="open"
+        else
+          echo "Milestone $MILESTONE_NAME already exists"
+        fi
+
+    - name: Set milestone on PR if none is set
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        PR_NUMBER: ${{ github.event.pull_request.number }}
+      run: |
+        milestone=$(gh pr view ${PR_NUMBER} --json milestone --jq '.milestone.title')
+        if [ "$milestone" = "null" ] || [ -z "$milestone" ]; then
+          echo "Setting milestone $MILESTONE_NAME on PR #${PR_NUMBER}"
+          gh pr edit ${PR_NUMBER} --milestone "$MILESTONE_NAME"
+        else
+          echo "PR already has milestone: $milestone"
+        fi
+