This study tested a theory of planned behavior (TPB)-based model in predicting human papillomavirus (HPV) vaccination intentions and series completion among university students. A nonexperimental, cross-sectional design was utilized with a convenience sample of 281 university students, including 40.9% nonvaccinees, 19.6% vaccine initiators, and 39.5% series completers. The stepwise multiple regression model revealed that attitude and subjective norm were significant predictors of behavioral intention and collectively explained 60% of its variance. The logistic regression model identified behavioral intention and gender as significant predictors of series completion. Findings suggest that: (a) nonvaccinees with more positive attitudes and greater subjective norm have greater intentions to complete the series, and (b) college females and those who have greater intentions to get vaccinated have greater odds of completing the series. For those not vaccinated, practitioners should aim to increase students' positive attitudes and perceived social pressure regarding series completion. Health educators should aim to develop HPV-related programs that target college men and increase students' behavioral intention by applying implementation intention strategies that encourage series completion.