Clarence Daniel Martin (June 29, 1886 – August 11, 1955) was an American politician who served as the 11th governor of Washington from 1933 to 1941. A member of the Democratic Party, he was appointed to fill a vacancy in the Washington House of Representatives in 1944 and was the first governor born in the territory of the state. He married Margaret Mulligan of Spokane in 1907, and they had three sons. Martin died in 1955 at the age of 69 and is buried at the Fairmount Memorial Park in Spokane.