Bradwell Waterside is a small hamlet in Essex, England.

The population of the hamlet is included in the civil parish of Bradwell-on-Sea.

It has a marina and is about a mile north-northwest of Bradwell-on-Sea on the Blackwater Estuary on the northern edge of the Dengie peninsula.

The hamlet sits at the end of the B1021, the main road through the north of the Dengie peninsula to Latchingdon, and on the coast of Bradwell Creek, a channel next to the Blackwater.

Nearby, there is the former Royal Air Force base RAF Bradwell Bay, owing to the flat land of the Dengie.