William Darrell "Billy" Mays, Jr. (July 20, 1958 - June 28, 2009) was an American (United States) television direct-response (direct-response marketing) advertisement salesperson (Sales#Sales agents) most notable for promoting OxiClean, Orange Glo, and other cleaning, home-based, and maintenance products. His distinctive beard and impassioned sales pitches made him a recognized television presence in the United States and Canada.

Mays was born in McKees Rocks (McKees Rocks, Pennsylvania), Pennsylvania, and began his career as salesman on the Atlantic City boardwalk (Atlantic City, New Jersey). He traveled across the United States for 12 years, selling various items before he was hired to sell OxiClean and other products on the Home Shopping Network. His success as a TV pitchman led him to found Mays Promotions, Inc. On April 15, 2009, the Discovery Channel began airing PitchMen, a documentary series that featured Mays. On the morning of June 28, 2009, Mays wife found him dead in his home.