Objective: To assess the effectiveness of a reproductive health educational package to reduce RSB among undergraduates in selected state universities in Sri Lanka. Methods: A quasi-randomized controlled trial was conducted among undergraduates in 2014. Two universities were selected randomly either to the intervention or as the control group. From each of the selected universities, 10 clusters of students were selected randomly. A reproductive educational package was developed with reference to a curriculum by Centre for Disease Control, adjusted locally. The intervention group (n=309) received two health educational sessions with a gap of one week while the control group (n=431) did not receive any. The primary outcome was the reduction of RSBs while the secondary outcomes were the improvement of overall knowledge and overall attitudes on reproductive health at three months after the intervention. Intention to treat analysis was performed. Baseline imbalances were controlled by applying logistic regression. Results were expressed as adjusted odds ratios (AOR) and 95% confidence interval (CI).