Spencer's Island is a rural community in Cumberland County, Nova Scotia, located at the western end of Greville Bay on the Bay of Fundy. The community is named after a small island 45°19′50″N 64°41′30″W of the same name located offshore from nearby Cape Spencer. According to local oral history, the island, cape and community trace their name to a man named Spencer who is buried on the island. However the name more likely comes from Lord Spencer, a British statesman at the time the community was settled.

Cumberland County is a county in the Canadian province of Nova Scotia.