List of highways numbered 21A
Route 21A, or Highway 21A, may refer to:
India
- National Highway 21A
United States
- County Road 21A
- M-21A
- Nebraska Spur 21A
- New Jersey Route 21A
- New York State Route 21A
- * County Route 21A
- * County Route 21A
- * County Route 21A
- Secondary State Highway 21A