Maryland, which didn't lose an Atlantic Coast Conference game at home all last season, dropped its first conference game of the new season, 79-75, to Boston College despite a career-high 27 points from center Jordan Williams.
The Eagles won by shooting 7-for-12 on 3-pointers in the second half. They made 13 3s in the game.
With the Terps trailing 78-75, Maryland guard Terrell Stoglin (14 points on 6-for-17 shooting) missed a 3-pointer from the top of the key with 17 seconds left.
Boston College's Corey Raji made a free throw for the final margin.
The Terps (7-4) missed three critical free throws in the final moments -- one by Stoglin and two by Cliff Tucker.
Maryland was also hurt by shooting 3-for-17 on 3s.
There were 16 lead changes in the game.
Boston College (8-2) was led by Biko Paris with 22 points.
Williams topped his career high of 26 points. Maryland co-captain Dino Gregory matched his career high with 14 points. He made his first five field-goal attempts of the game.