This is a big score for new Auburn coach Bruce Pearl, as Mason is available to play immediately because he has already graduated from Niagara.
Mason, a 6-foot-3 guard, is the son of former New York Knicks forward Anthony Mason.
He averaged 25.6 points last season in 33 games for Niagara, and left the program as the school's third all-time leading scorer. He was second in the NCAA in scoring behind Creighton All-American Doug McDermott (26.7).
He shot 44 percent from the field and averaged 3.6 rebounds for the Purple Eagles, who went 7-26 last season.
"It was a close decision I would like to thank every school who had interest in me. I would like to give a special shout out to Niagara that's still my second home Imma miss everyone who made my 4 years there," Mason said on his Twitter page. HAMILTON: First Look: Kentucky and Florida should battle for SEC supremacy again