As manager William Thomas Gregg (born July 29, 1963) is an American former Major League Baseball (MLB) outfielder/first baseman who played for the Pittsburgh Pirates, Atlanta Braves, Cincinnati Reds, and Florida Marlins from 1987 to 1997.

Gregg attended Richard J. Reynolds High School in Winston-Salem, North Carolina.

[3][4] He played in the majors from 1987 to 1997 for the Pittsburgh Pirates, Atlanta Braves, Cincinnati Reds, and Florida Marlins.

Gregg was named as the hitting coach for the New Orleans Baby Cakes in the Miami Marlins organization for the 2018 and 2019 seasons.

In February 2024, it was announced that Gregg would take on the role of manager for the newly established Tri-State Coal Cats in Huntington, West Virginia, part of the Appalachian League.