William M. Calder (March 3, 1869 - March 3, 1945) was a United States politician from New York State. Calder was born in Brooklyn, New York and died there on his 76th birthday. He represented New York as a Republican in the House of Representatives from 1905 until 1915. In 1916 he was elected to the United States Senate and served one term, from 1917 to 1923 after he lost his 1922 reelection bid to Democrat Royal Copeland.
Preceded by: James A. O'Gorman U.S. Senator (Class 1) from New York 1917-1923 Succeeded by: Royal S. Copeland
