|Born: August 5, 1937|
|April 16, 1961, for the Minnesota Twins|
|Last MLB appearance|
|September 15, 1966, for the Minnesota Twins|
|Earned run average||4.07|
William Pleis III (born August 5, 1937 in Kirkwood, Missouri) is a retired American professional baseball player, a left-handed pitcher who appeared in 190 Major League games between 1961 and 1966 for the Minnesota Twins. On April 22, 1961, Pleis notched the Twins' first-ever win in their new home state and home field, Metropolitan Stadium.
Pleis, listed at 5 feet 10 inches (1.78 m) tall and 170 pounds (77 kg), was a relief pitcher for all but ten of his 190 big-league appearances. In 1965, he equaled his career season-high for saves (four) and won four other games as the Twins captured their first American League pennant and the franchise's first since 1933, when it was located in Washington. He appeared in the 1965 World Series against the Los Angeles Dodgers, a team he would serve as a longtime scout after the end of his playing career. He gave up two hits and an earned run in one inning pitched in Game 4, a game the Dodgers won 7–2 to even the series at two wins each. Los Angeles went on to prevail in seven games.
- Minnesota Twins 1961 game log from Retrosheet
- 1965-10-10 box score from Retrosheet
- Fenech, Anthony (March 25, 2018). "Meet the men trying to rebuild the Detroit Tigers". Detroit Free Press. Retrieved 7 December 2021.
- Career statistics and player information from Baseball Reference