Gregory Lee Walker (born October 6, 1959) is a former power-hitting first baseman in Major League Baseball (MLB).
He played in MLB from 1982 to 1990.
He is the former hitting coach of the Chicago White Sox, the team for which he played all but the last 14 games of his career, until leaving the White Sox to become the hitting coach for the Atlanta Braves, a position he held from 2012 until 2014.