Gregory Scott Booker (June 22, 1960 – March 30, 2019) was an American professional baseball pitcher.

He pitched in all or part of eight seasons in Major League Baseball, from 1983 until 1990.

Booker pitched the final 3 innings to preserve the win for starting pitcher Ed Whitson.

[3] Booker's widow, Kristi, is the daughter of long-time major league manager Jack McKeon.

On June 29, 1989, McKeon, often called "Trader Jack", traded his own son-in-law to the Minnesota Twins for pitcher Freddie Toliver.