Arthur Wallace McMaster (born 2 December 1945) is an Irish former international rugby union player.
Born in Ballymena, McMaster was a defensively-minded three-quarter, fast on the break, who played his club rugby with Ballymena RFC. He most often appeared on the left wing and was a regular for Ulster.
McMaster won 18 Ireland caps, debuting in the 1972 Five Nations. He was a Five Nations winner in 1974 and made his last Ireland appearance against the All Blacks in Wellington on their 1976 tour.