Introduction: Teenage pregnancy is a global public health challenge, and it is a major contributor to the high maternal and neonatal morbidity and mortality rates reported in sub-Saharan Africa and Uganda. However, there is a paucity of data regarding pregnancy outcomes and their associated factors among teenagers in Uganda. The purpose of this study was to determine the prevalence and factors associated with pregnancy outcomes among teenagers who delivered at a National Referral Hospital in Kampala, Uganda. Materials and Methods: This cross-sectional study was conducted among teenage mothers who delivered at a National Referral Hospital in Kampala, Uganda. Consecutive participant recruitment was done for those who fulfilled the eligibility criteria. The outcomes of interest included adverse maternal outcome with obstructed labor being used as a proxy and adverse fetal outcomes with birth asphyxia used as a proxy. Logistic regression analysis was used to determine the association between independent and dependent variables with a 5% level of statistical significance (α = 0.05). Results: Teenage pregnancy was associated with adverse maternal outcomes which included obstructed labor (18%) and preterm labor (5.5%). There were no maternal deaths during the study period. Adverse fetal outcomes observed in this study population included low birth weight (83%), birth asphyxia (18%), and stillbirth (4%). The only factor associated with adverse maternal outcome was gestational age where teenage mothers had 4 times likelihood of delivering before 37 weeks. Relatedly, teenage mothers had an 81% chance of having a preterm birth. Conclusion: Teenage pregnancy was generally not associated with adverse maternal or fetal outcomes except for preterm birth. The reasons for adverse pregnancy outcomes may reflect a combination of gynecological and biological immaturity, as well as adverse socioeconomic pressures.