Julius Hauser (c. 1854 in the Grand Duchy of Baden – March 26, 1920 Sayville, Suffolk County, New York) was an American businessman and politician.

He learned the baker's trade, and in 1878 settled in Sayville where he ran a large bakery business.

Although William R. Hearst, the leader of the League was defeated for Governor by Charles Evans Hughes, all the other nominees were elected, and Hauser was Treasurer from 1907 to 1908.

In May 1907, a forest fire destroyed his huckleberry farm on Long Island.

He died of stomach cancer at his residence on Green Avenue in Sayville.