Hiram Merritt Barton (December 18, 1856 – December 11, 1928) was an American businessman and politician.
Born in El Monte, California, his father was Ben Barton, who was a physician, businessman, and politician.
Hiram Merritt Barton was responsible for the development of the San Bernardino Valley.
In 1887, Barton served in the California State Assembly as a Democrat.
From 1905 to 1907 Barton served as mayor of San Bernardino, California.