OBJECTIVE Estrogens are suspected to have a negative effect on pulmonary function in women with cystic fibrosis (CF). The aim of our study was to investigate, in a CF adolescent population, the effect of hormonal contraception (HC) on lung function by assessing the forced expiratory volume in 1 second (FEV1), the number of exacerbations of pulmonary condition, and antibiotic use. DESIGN, SETTING, PARTICIPANTS, INTERVENTIONS, AND MAIN OUTCOME MEASURES: We conducted a cohort retrospective chart review of girls from age 13 to 18 years old who were followed in the CF clinic of a university hospital center. Wilcoxon rank sum test with continuity correction, 2-sample t test, conditional test of Poisson rates, and χ2 test were conducted to identify differences in results between adolescents with or without use of HC for the following outcomes: FEV1, use of antibiotics by nebulizer, and hospital admission for exacerbations of pulmonary condition. RESULTS Among 127 adolescents, 64/127 (50.4%) took HC; 12/127 (9%) continuously had been taking HC over 3 years. For girls taking HC for more than 3 years, FEV1 at 18 years old was significantly higher than for girls who had never taken HC (85.17% vs 71.05%; P = .043). However, there was no difference in the number of hospital admissions for exacerbation of pulmonary condition between these 2 groups (P = .057). There was no difference between HC vs non-HC users in the percent of patients taking antibiotics by nebulizer over the 6 years of follow-up. CONCLUSIONS Our study suggests that in adolescents with CF, HC has no deleterious effects on the FEV1. Further prospective studies could be done to confirm these results.