John L. Bacon (November 3, 1878 – April 25, 1961) was an American civil engineer and Republican politician from California. Bacon was born in 1878 in Illinois. By 1914, he was in San Diego, when he was on a Panama-California Exposition committee. He was a structural engineer and helped lay out the aquatic features of the San Diego Zoo. During and after his term as mayor, Bacon was president of Boulder Dam Association, a group that promoted funding for the construction of Hoover Dam, and was seeking a share of Colorado River water for use by Southern California cities.