Student Ryan Allen beat out two women for the title at the small school in suburban Washington, D.C., famous for its run to the Final Four a few years back.
Allen competed under his drag queen persona of Reann Ballslee.
Allen, who is gay and performs in drag at nightclubs, said he entered as a joke. But he considers the victory one of his happiest moments and proof the school celebrates its diverse student body.
The senior from Virginia's Goochland County won the pageant about a week ago at a sold-out homecoming basketball game against Northeastern. George Mason's basketball team pulled off a string of upsets to advance to the Final Four in 2006.
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