Don Wilson Lock (born July 27, 1936) is an American former professional baseball player who played outfield in the Major Leagues from 1962 to 1969 for the Washington Senators (1962-1966), Philadelphia Phillies (1967-1969), and Boston Red Sox (1969). Lock attended Wichita State University, stood 6 ft 2 in (1.88 m) (1.88 m) tall and weighed 202 pounds (92 kg). He threw and batted right-handed.
Lock signed with the New York Yankees in 1958 but never appeared in an MLB game for the Yanks. Instead, he was recalled from the Triple-A Richmond Virginians on July 11, 1962, and traded to Washington for veteran first baseman and pinch hitter Dale Long. Lock played left field that season, but by early 1963 he became the Senators' regular center fielder, supplanting the Jimmy Piersall, who was traded to the New York Mets.
His two most productive seasons were 1963 and 1964, when he hit 27 and 28 home runs and drove home 82 and 80 runs batted in respectively. Lock led American League center fielders in put-outs, assists and double plays turned in 1963, and all AL outfielders in assists the following year. As a batter, he finished second in the league in strikeouts in both 1963 and 1964.
Overall, Lock appeared in 921 games over eight seasons, batting .238 with 122 home runs and 373 RBI. He managed in the Red Sox farm system for two seasons (1971-1972, with the Winston-Salem Red Sox and Pawtucket Red Sox), and in part of 1973 for the Wilson Pennants, a co-op team in the Carolina League, after his playing career ended.