Frederick Peter "Cy" Falkenberg (December 17, 1879 – April 15, 1961) was an American professional baseball pitcher. He played in Major League Baseball (MLB) from 1903 to 1917 for the Pittsburgh Pirates of the National League, the Washington Senators, Cleveland Naps, and Philadelphia Athletics of the American League and the Indianapolis Hoosiers, Newark Peppers, and Brooklyn Tip-Tops of the Federal League.