Birchington-on-Sea is a village in north-east Kent, England, with a population of around 10,000.

It is part of the Thanet district and forms part of the civil parish of Birchington. It lies on the coast facing the North Sea, east of the Thames Estuary, between the seaside resorts of Herne Bay and Margate. As a seaside resort, the village is a tourist and retirement destination. The village's Minnis Bay is a family beach with attractions such as sailing, windsurfing, a paddling pool and coastal walking routes. Its three smaller beaches are surrounded by chalk cliffs, cliff stacks and caves.