Introduction: Nigeria has battled the scourge of HIV/AIDs since its outbreak with concerted efforts made towards its reduction and total eradication, but progress has been slower than expected. Therefore, this study investigates prevalence of risky sexual behaviour (RSB) which is predicated as bane of eradicating HIV/AIDs among the most vulnerable - Adolescent Girls and Young Women (AGYW). Methods: This study used 2018 Nigerian Health and Demographic Survey data. Samples were selected independently using two-stage sampling scheme with 1,400 Enumeration Areas (EAs) selected at first stage. Systematic sampling was used in selecting 40,427 households at second stage from which nationally representative sample of 41,821 women aged 15-49years were successfully interviewed to examine AGYW risky sexual behaviours in association with some sociodemographic factors on which such RSB thrive using the multivariate logistic regression model. Results: It was found that 41.1% and 28.3% of the adolescents and young women are involved in RSB, respectively. Adolescent girl who has at least secondary education is significantly less likely (OR=0.63, CI=0.44–0.90) to engage in RSB. Young women cohabiting and those ever married are more likely to be engaged in RSB with those cohabiting (OR=2.11, CI=1.40–3.20) having higher risk than those who are ever married (OR=1.59, CI=1.15–2.20). Conclusion: Having little or no formal education, nonreligious, regional differences, cohabitation, larger household sizes and living in poorer households increase RSB among AGYW. Therefore, to end the HIV/AIDS epidemic in Nigeria; regional and community-based interventions must be intensified early among the adolescent girls and young women

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