Arthur Farley Mayo III (May 10, 1936 – November 3, 2015) was an American businessman and politician from Maine.
Mayo served as a Democratic State Senator from Maine's 19th District, representing part of Sagadahoc County, including the population centers of Bath and Topsham from 2002 to 2006.
In 2006, Paula Benoit defeated Mayo for re-election.
A year later in 1959, he graduated from Cincinnati College of Mortuary Science.
In 1973, Mayo graduated with a Master's in Education from the University of Southern Maine.