George DeWitt Mason (July 4, 1856 – June 3, 1948) was an American architect who practiced in Detroit, Michigan, in the latter part of the 19th and early decades of the 20th centuries.

[2][3] Mason began his architectural career working for Detroit architect Hugh Smith in 1875, but this only lasted a summer.

Mason started out assigned to some specific detailing work on the George O. Robinson House[4] and the Detroit Public Library.

[5] One of the first buildings in which Mason received equal billing for the design was the Ransom Gillis House.

[9] Mason died on June 3, 1948, at his home in the Wilshire Apartments building, at the age of 91.