Arthur Jules Marion (November 19, 1884 - April 5, 1941) was a Métis politician and businessman.

He was first elected as a Liberal MLA in the district of Île-à-la-Crosse in a by-election held in April 1926 after incumbent Joseph Octave Nolin died in office in December 1925.

Notably, he had been earlier defeated in 1934 by Deakin Alexander Hall, who was also running Liberal.

In July 1941, a by-election was held to fill to the seat left vacant by Marion's own death in office in April 1941.

Marion was the brother-in-law of federal Liberal Senator William Albert Boucher.