Guy Evans Cooper (January 28, 1893 – August 2, 1951), nicknamed "Rebel", was a pitcher in Major League Baseball who played from 1914 through 1915 for the New York Yankees (1914–15) and Boston Red Sox (1915).
In a two-season career, Cooper posted a 1–0 record with eight strikeouts and a 5.33 ERA in 11 appearances, including one start, seven games finished, and 27.0 innings pitched.
He managed the Ogden team in the Utah–Idaho League for part of the 1926 season.
Cooper died in Santa Monica, California at age 58.
This biographical article relating to an American baseball pitcher born in the 1890s is a stub.