Robert Ransom Rush (December 21, 1925 – March 19, 2011) was a professional baseball player who pitched in MLB from 1948 to 1960.

Rush played for the Milwaukee Braves, Chicago Cubs, and the Chicago White Sox.

On June 11, 1950, Rush and pitcher Warren Spahn of the Braves each stole a base against each other; no opposing pitchers again stole a base in the same game until May 3, 2004, when Jason Marquis and Greg Madduxrepeated the feat.

Rush was an All-Star selection in 1950 and 1952.

He was the Milwaukee starting pitcher for Game 3 of the 1958 World Series. Rush gave the Braves six strong innings, allowing the New York Yankees only three hits. But control problems proved costly, Rush's three walks loading the bases for Hank Bauer's two-run single. Those were all the runs Yankee starter Don Larsen needed in a 4-0 win.

Rush was born in Battle Creek, Michigan, and died in Mesa, Arizona.