Arthur B. Barret (August 23, 1836 – April 24, 1875) was the 22nd mayor of St. Louis, Missouri, but died of an illness only 11 days after taking office.
Barret was born on his family farm in Sangamon County, Illinois, near the state capital of Springfield.
A few years later, he moved to St. Louis where he met and married his wife, Miss Anna F. Swerengen, in June 1859 with whom he had three children.
Shortly after the American Civil War, Barret succeeded his cousin, Colonel J. Richard Barret, to become president of the St. Louis Agricultural and Mechanical Association, a group that organized many large fairs held on the lands that would become Fairground Park in St. Louis.
On April 6, he was elected mayor of St. Louis having defeated Henry Overstolz with a large majority of the vote.