Objective: To determine which factors are associated with the use of dual protection in obstetrics students from a public university in Lima, Peru. Methods: Analytical cross-sectional study, done in 217 obstetrics students from the Universidad Nacional Mayor de San Marcos.The chi-squared test was applied, in addition to the raw and adjusted prevalence ratio (PR) Results: The prevalence of the use of dual protection was 41.5%. In the bivariate analysis, the factors associated with it included: age from 25 to 29 years old (raw prevalence ratio: 1.57), Lima as a place of origin (raw prevalence ratio: 2.07), previous pregnancy (raw prevalence ratio: 1.91), previous abortion (raw prevalence ratio: 1.92), antecedent of STI in the couple (raw prevalence ratio: 1.81), knowledge about dual protection (raw prevalence ratio: 3,16), and orientation in family planning (raw prevalence ratio: 1.76). In the multivariate analysis, knowledge about contraceptive protection maintained its significant association (adjusted prevalence ratio: 2.44). Conclusions: Knowledge about contraceptive protection is the only reproductive factor that was associated with a higher probability of using this method. Keywords: Contraceptives, Risk Factors, Contraceptive Hormonal, Condoms.