Mosley scored all but two of his points in the second half, and was 10 of 10 from the foul line, as he led Maryland (12-4, 2-1 Atlantic Coast Conference) to its ninth win in 10 games.
Terrell Stoglin, the ACC's leading scorer, added 14 points for the Terrapins despite playing with a sore back. He had seven points in a row during an early second-half run and scored in double figures for the 15th time this season.
James Padgett scored 14 points and led Maryland with nine rebounds. He was 6 of 7 from the foul line, where Maryland hit 19 of 23.
Maryland has beaten Georgia Tech (8-9, 1-2) in 11 straight regular-season games, the only loss since 2004 coming in the 2010 conference tournament.