Thomas Henry Timmermann (born May 12, 1940) is a former American baseball player.
He played professional baseball for 15 years from 1960 to 1974, including six seasons in Major League Baseball as a pitcher for the Detroit Tigers (1969–1973) and Cleveland Indians (1973–1974).
He compiled a 35–35 win–loss record and a 3.78 earned run average (ERA), and recorded 35 saves and 315 strikeouts, in 228 major league games and 548 innings pitched.After setting a Detroit club record with 61 pitching appearances in 1970, all as a relief specialist, Timmermann was voted "Tiger of the Year" by the Detroit chapter of the Baseball Writers' Association of America.
During a minor league game in 1968, he tied a professional baseball record by recording the maximum of 27 infield outs in a nine-inning game for the Criollas de Caguas in the Puerto Rican Winter League.