Sonny Siebert, American baseball player was born on January 14, 1937.

Wilfred Charles "Sonny" Siebert is a former Major League Baseball right-handed pitcher from 1964 to 1975. He finished with a record of 140-114 and a 3.21 ERA. He threw a no-hitter on June 10, 1966, against the Washington Senators. He was drafted simultaneously by the Cleveland Indians and the St. Louis Hawks of the NBA.