Mark Belanger, American baseball player (d. 1998)
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 one World Series championship between 1966 and 1979.

A defensive standout, Belanger won eight Gold Glove Awards between 1969 and 1978, leading the American League in assists and fielding percentage three times each; he retired with the highest career fielding average by an AL shortstop (.977). In defensive Wins Above Replacement (WAR), Belanger is tied with Ozzie Smith and Joe Tinker for most times as league leader with six. Belanger set franchise records for career games, assists, and double plays as a shortstop, all of which were later broken by Cal Ripken Jr. After his playing career, he became an official with the Major League Baseball Players Association. In 1983, Belanger was inducted into the Baltimore Orioles Hall of Fame.