Lawrence Patrick David Gillick (born August 22, 1937(1937-08-22)) is a retired American professional baseball executive. He was the general manager of four Major League Baseball teams, and guided teams to three World Series championships in his career: 1992 and 1993 titles with the Toronto Blue Jays, and a 2008 title with the Philadelphia Phillies.

Gillick was elected to the National Baseball Hall of Fame in 2010 by its Veterans Committee. He will be formally inducted in 2011.

Gillick was born to former minor league baseball player Larry Gillick in Chico, California. After graduating from Notre Dame High School in Sherman Oaks, California, Pat attended USC and joined the Delta Chi Fraternity. He graduated in 1958 with a degree in business. He was also a gifted pitcher, playing on the 1958 National Title baseball team at USC and spending five years in the minor league systems of the Baltimore Orioles and the Pittsburgh Pirates, venturing as high as Triple-A. A left-hander, Gillick posted a won/lost record of 45–32 with an earned run average of 3.42 in 164 minor league games.