Jonathan Mayhew Wainwright (December 10, 1864 – June 3, 1945) was an American lawyer and politician from New York.

He served as lieutenant colonel, inspector general's department, New York National Guard, on the Mexican border in 1916.

During the First World War, Wainwright served as a lieutenant colonel in the Twenty-seventh Division from 1917 to 1919.

He resumed the practice of law and served as a member of the Westchester County Park Commission from 1930 to 1937.

[2] His funeral was held at Christ's Church, Rye,[2] and he was buried at the Greenwood Union Cemetery.