Robert Anton Grim (March 8, 1930 – October 23, 1996) was a pitcher in Major League Baseball.

Grim got the final out of the 1957 All-Star Game, being brought in from the bullpen with the American League leading 6–5 and getting pinch-hitter Gil Hodges on a game-ending fly out to left field.

He also took the loss in Game 4 of the 1957 World Series when he allowed a walk-off home run to Milwaukee Braves third baseman Eddie Mathews.

On June 15, 1958, the Yankees traded Grim, along with Harry Simpson, to the Kansas City Athletics for Duke Maas and Virgil Trucks.

Grim died in Shawnee, Kansas at age 66 after suffering a heart attack while throwing snowballs with neighborhood kids.