William Lewis Hepler (born September 25, 1945) is a retired American professional baseball player. He was a left-handed pitcher who was drafted in 1965 by the New York Mets. He played for the Mets for one season before being sent back down to Minor League A-level baseball. He stood 6 feet (1.83 m) tall and weighed 160 pounds (73 kg). Hepler returned to the minor leagues in 1967 and concluded his playing career after the 1970 season.