Leland Stanford "Larry" MacPhail Sr. (February 3, 1890 – October 1, 1975) was an American lawyer and an executive in Major League Baseball.

He accompanied his commander, Colonel Luke Lea, on an unsanctioned mission to Amerongen in the Netherlands in January 1919 to attempt to arrest the exiled German monarch, Kaiser Wilhelm II, and bring him to the Paris Peace Conference to be tried for war crimes.

While in the role of president of the Red Birds, MacPhail came up with a plan to create a geographically based playoff system for determining the league champion of the American Association.

"[3] After leaving the Reds, he spent about a year with his father's investment business before becoming executive vice-president and general manager of the Brooklyn Dodgers in 1938.

MacPhail's innovations include nighttime baseball, regular game televising, and flying teams between cities.

MacPhail's grandson Andy said, "My grandfather was bombastic, flamboyant, a genius when sober, brilliant when he had one drink and a raving lunatic when he had too many.

Though he had already quit as chief executive in the Yankee locker room, books by Roger Kahn and others indicate MacPhail's behavior at the victory parties led to co-owners Dan Topping and Del Webb buying out his share of the ballclub.

"[10][11] MacPhail died in a Miami nursing home on October 1, 1975, two days after Hall of Fame manager Casey Stengel.

He was elected to the Baseball Hall of Fame in 1998, making him and Larry MacPhail the only father and son inductees.

[13] In 2013, the Bob Feller Act of Valor Award honored MacPhail as one of 37 Baseball Hall of Fame members for his service in the United States Army during World War II.