Washburn Island is a 330-acre (1.3 km2) island off the coast of East Falmouth, Massachusetts within Waquoit Bay. It is home to some primitive campsites and is part of the Waquoit Bay National Estuarine Research Reserve. It is part of the Town of Falmouth, in Barnstable County in the village of Waquoit.
During World War II, the island was home to Camp Washburn.