Robert Lamar Rensberger (March 7, 1921 – September 6, 2007) was an American professional basketball player.

He played one season for the Chicago Stags of the Basketball Association of America (BAA) in 1946–47.

He then enrolled at the University of Notre Dame and played for the men's basketball team from 1940–41 to 1942–43.

During the middle of his senior year, Fighting Irish head coach George Keogan suffered a heart attack and died.

[3] Rensberger and his teammates served as the pallbearers for Keogan's funeral on the afternoon of February 20, 1943, before playing a game that same night.