Mark Henry Belanger (June 8, 1944 – October 6, 1998), nicknamed "The Blade," was an American professional baseball player and coach. He played 18 seasons in Major League Baseball as a shortstop from 1965 through 1982, most notably as a member of the Baltimore Orioles dynasty that won six American League East division titles, five American League pennants, and two World Series championships between 1966 and 1979.