William Peter Popp (June 7, 1877 – September 5, 1909) was a Major League Baseball pitcher who played for the St. Louis Cardinals in 1902. He later was a manager in the minor leagues in 1904.

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1877 births 1909 deaths Major League Baseball pitchers St. Louis Cardinals players Baseball players from Missouri Minor league baseball managers Little Rock Travelers players Toledo Swamp Angels players Columbus Senators players Terre Haute Hottentots players Vincennes Alices players {{US-baseball-pitcher-1870s-stub