Arthur Thomas Hannett (February 17, 1884 – March 18, 1966) was an American lawyer and politician who rose to become the seventh governor of New Mexico.

He was born on February 17, 1884, in Lyons, New York, the son of William Hannett and Mary McCarthy.

His first public office was City Attorney and he also served as Mayor of Gallup for four years.

During his tenure U.S. Route 66 was rerouted to avoid Santa Fe and instead passed through Albuquerque, New Mexico.

Legend says Hannett did the rerouting to punish the Republican Santa Fe Ring which had controlled New Mexico politics in the late 19th and early 20th centuries.