Mark Grater

Mark Anthony Grater (born January 19, 1964) is an American former professional baseball pitcher. Grater played in nine games over parts of two seasons for the St. Louis Cardinals and the Detroit Tigers of Major League Baseball (MLB). He batted and threw right-handed.

Grater attended Monaca High School in Monaca, Pennsylvania and began his college baseball career at the Community College of Beaver County.

As of 2011, Grater was in his eighteenth year as a pitching coach and was working for the Washington Nationals as their pitching rehabilitation coordinator. Prior to the 2021 season, he was named Washington's rehabilitation and Dominican Republic pitching coordinator.