Frederick Walter Lasher (August 19, 1941 – February 27, 2022) was an American Major League Baseball pitcher who played six seasons with the Minnesota Twins (1963), Detroit Tigers (1967–1970), Cleveland Indians (1970), and California Angels (1971).

Over six major league seasons, he appeared in 151 games (all but one as a relief pitcher) and had a won–lost record of 11–13 with 22 saves and a 3.88 earned run average; in 202 innings pitched, he permitted 179 hits and 110 bases on balls; he struck out 148.

In 1968, Lasher appeared in 34 games for the pennant-winning and world champion Tigers, finishing with a 5–1 record and a 3.33 earned run average.

In his only MLB starting pitcher assignment, on July 12, 1970, at Cleveland Stadium against the Boston Red Sox, Lasher recorded two outs in the first inning before permitting a single to Carl Yastrzemski.

In the second inning, however, he surrendered back-to-back home runs to Conigliaro's brother and teammate, Billy, and Boston catcher Tom Satriano, and was removed from the game for a relief pitcher.