Donald Ralph Wert (born July 29, 1938), nicknamed "Coyote", is an American former professional baseball player. He played as a third baseman in Major League Baseball for the Detroit Tigers from 1963 to 1970 and also briefly played for the Washington Senators in 1971. In 1965, he was named "Tiger of the Year", and in 1968, he was chosen for the American League All Star Team and won a World Series ring.

Born in Strasburg, Pennsylvania, in Lancaster County, Wert attended Franklin & Marshall College in Lancaster, Pennsylvania where he played baseball for the "Diplomats." He was signed by the Detroit Tigers as an amateur free agent in 1958 and played several years in the minor leagues.

Wert reached the major leagues in 1963 at the age of 24 and became the Tigers' regular third baseman from 1964–1970. Though never a strong hitter, Wert earned a reputation as one of the best fielding third basemen. In 1965, Wert played all 162 games for the Tigers and led all American League third basemen with a .976 fielding percentage, marking the only year in the 1960s that a third baseman other than Brooks Robinson had led the league in fielding. He also led the team with 159 hits, had a .341 on-base percentage fueled by a career-high 73 walks, and even showed some power with hit 12 home runs. With his performance in 1965, Wert was selected for the first annual "Tiger of the Year" by the Detroit chapter of the Baseball Writers' Association of America, and also finished No. 10 in the American League Most Valuable Player voting. Wert had his best season as a batter in 1966, when he had a .268 batting average, .342 on-base percentage, 20 doubles, 11 home runs, and 70 RBIs.