Rehoboth Bay is a body of water in Sussex County, Delaware.

It is connected to the Broadkill River by the Lewes and Rehoboth Canal.

Its depth is generally shallow, less than 6 to 7 feet below Mean Lower Low Water.

The surface area of the bay is approximately 13 square miles.

Rehoboth Bay is linked to Indian River Bay to the south, providing tidal exchange with the Atlantic Ocean through Indian River Inlet, which is stabilized by two parallel stone jetties.