This study aims to measure the level of entry into motherhood among internally displaced adolescent girls in Kaya and Kongoussi communes, Burkina Faso, and to analyze the factors associated with it. Data were collected from 404 adolescent girls aged 12-19 years in a cross-sectional survey conducted between July and August 2021. The proportion of internally displaced adolescent girls who had started childbearing was 26.5%. Age, marital status and current use of modern contraception were found to be significantly associated with entry into motherhood among internally displaced adolescent girls. Marital status mediates the effect of religion and employment on entry of the adolescents into motherhood. The results suggest that actions aimed at preventing early marriage and improving employment opportunities among adolescent girls could potentially prevent their early entry into motherhood.