Jordan Williams had 10 points and six rebounds in the first half, and Maryland leads N.C. State 42-33 at halftime.
The Terrapins jumped out to a 12-2 lead, but the Wolfpack cut the lead to five at 15-10 on a pair of Javier Gonzalez free throws.
Maryland then went on a 16-4 run to push its lead to 17 before N.C. State cut it to nine at the half.
Ryan Harrow led the Wolfpack with eight first-half points, and Gonzalez chipped in seven.
Nine different Maryland players scored in the first half.