The Friendship sloop, also known as a Muscongus Bay sloop or lobster sloop, is a style of gaff-rigged sloop that originated in Friendship, Maine around 1880. Fishermen in Friendship and neighboring Bremen collectively originated the design, one influenced by the fishing sailboats of Gloucester, Massachusetts, particularly the schooner Fredonia of 1889. Although familiar as a pleasure craft today, the Friendship sloop was the traditional fishing boat used off the coast of Maine, especially for lobstering, until the introduction of the gasoline engine early in the 20th century. Friendship-area boat builder Wilbur A. Morse produced many examples from the 1880s to the 1910s.