Mark Peter Weidemaier (born January 17, 1955) is an American baseball manager for the Bismarck Larks of the Northwoods League.

He departed the Yankees to become the Director of Player Development for the Pastejé Baseball Academy of the Mexican League located in Jocotitlán, coaching future MLB stand-outs including Juan Castro and Ismael Valdez.

Over the course of his scouting tenure, players signed by Weidemaier included big leaguers such as Paul Sorrento, Herbert Perry, and Jonathan Nunnally.

[5][6] Several examples of Weidemaier's scouting reports are part of the digital archive being assembled by the National Baseball Hall of Fame in Cooperstown, New York.

In April 2018, Mark resigned from the Samsung team upon being hired by the Cincinnati Reds into an advance scouting role, under manager Jim Riggleman.

Mark then briefly managed the Westside (Detroit) Wooly Mammoths in the United Shore Professional Baseball League in 2019 before returning to South Korea with the Kia Tigers in late 2019.

[12] By mid-Summer, Weidemaier came on board with the Long Island Ducks in the Atlantic League of Professional Baseball (ALPB).