As the first U.S.-based evaluation of the The Fourth R: Strategies for Healthy Young Relationships, a dating violence prevention curriculum, this randomized controlled trial tests the effectiveness of the program with middle school students in the Bronx, New York. The curriculum, previously found to have limited impacts with Canadian ninth-graders, was found to have modest effects with the younger target audience. Notably, it was found to delay sexual activity for all participating students, and those students who received more of the program saw even greater delays in sexual activity, as well as reductions in bullying perpetration and attitudinal improvements. Results also suggest that high-risk students realized some reductions in dating violence.