Rehoboth Beach is a city along the Delaware Beaches in eastern Sussex County, Delaware, United States. Along with the neighboring coastal city of Lewes, Rehoboth Beach is one of the principal cities of Delaware's rapidly growing Cape Region. Fronting the beach is a boardwalk lined with restaurants, shops, hotels and amusements. 

A popular regional vacation destination, Rehoboth Beach's seasonal population expands to over 25,000 within the city limits and thousands more in the surrounding area in the summer. Out of the 30 states with coastline, the Delaware Beaches ranked number one in water quality in 2011.