William Watson Clark (May 16, 1902 – March 4, 1972) was an American baseball pitcher for the Cleveland Indians (1924), Brooklyn Robins/Dodgers (1927–33 and 1934–37) and New York Giants (1933–34).

Clark finished 20th in voting for the 1931 National League MVP for having a 14–10 win–loss record, 34 games (28 started), 16 complete games, 3 shutouts, 2 games finished, 1 save, 2331⁄3 innings pitched, 243 hits allowed, 86 runs allowed, 83 earned runs allowed, 4 home runs allowed, 52 walks, 96 strikeouts, 1 hit batsman, 3 wild pitches, 981 batters faced, 1 balk, 3.20 ERA and 1.264 WHIP.

He led the National League in walks/9 IP in 1930 (1.71) and 1935 (1.22), innings in 1929 (279), games started in 1929 (36) and 1932 (36), hits allowed in 1929 (295), losses in 1929 (19) and batters faced in 1929 (1,189).

He ranks 81st on the Major League Baseball career walks/9 IP list (1.97).

This biographical article relating to an American baseball pitcher born in the 1900s is a stub.