Arthur Joseph "Marty" Shay (April 25, 1896 – February 20, 1951) was a professional baseball player. He played parts of two seasons in Major League Baseball for the Chicago Cubs (1916) and Boston Braves (1924), primarily as a second baseman. Listed at 5 ft 7 in, 148 lb, Shay batted and threw right-handed. Born in Boston, Massachusetts, Shay was a .240 hitter (18-for-75) with three doubles and one triple in 21 games, stealing two bases and scoring four runs while driving in two more. Shay died in Worcester, Massachusetts, at the age of 54.