Billy Arnold Muffett (September 21, 1930 – June 15, 2008) was an American professional baseball player and coach. He pitched in the Major Leagues for all or parts of six seasons (1957–1962) for the St. Louis Cardinals, San Francisco Giants and Boston Red Sox. In his playing days, he stood 6 feet 1 inch (1.85 m) tall, weighed 198 pounds (90 kg), and threw and batted right-handed. He was born in Hammond, Indiana. Beginning his professional career in 1949, Muffett missed the 1952 and 1953 seasons due to military service. He returned to minor league baseball in 1954.