Saint Agnes or St Agnes may refer to:
Saints
- of Assisi (1197–253), abbess of the Poor Ladies, feast day November 16
- Agnes of Bohemia (1211–1282), also known as Agnes of Prague, feast day March 2
- Agnes of Montepulciano (1268–1317), feast day April 20
- Agnes of Rome (291–304), patron saint of chastity
Places
- St Agnes, Isles of Scilly, England
- St Agnes, Cornwall, England
- St Agnes, Avon, England
- St Agnes Place, a formerly-squatted street in London, England
- Sainte-Agnès, Alpes-Maritimes, in southern France