A descriptive retrospective study, was conducted on adolescent girls (10 to 19 years) at the University College Hospital (UCH), Ibadan to determine the common gynaecological conditions among these group of girls that attended gynaecological clinic of UCH between January 2000 and December 2007. Demographic characteristics including age, sex, occupation, religion, marital status and level of education were extracted from patients' medical records and recorded on a pre-designed data sheet. Presenting complaints and the definitive diagnosis were also recorded. A total of 243 adolescents presented within the study period. The commonest gynaecological complaint was abnormal vaginal discharge (44.4%) while the least was breast lump (1.7%). The commonest gynaecological diagnosis was reproductive tract infection (62.6%), out of which sexually transmitted infections constituted 40%. Infertility (1%) was the least diagnosed condition. Other gynaecological conditions included pregnancy related complications (6.6%), sexual abuse (3.3%), menstrual abnormalities (4.5%) and dysfunctional uterine bleeding (1.7%). Gynaecological complaints were commoner among the older (15 to 19 years) than the younger (10 to 14 years) adolescents (p < 0.01). It was concluded from this study that adolescents experience various forms of gynaecological morbidities, especially reproductive tract infections. We recommend sexual education and counselling for adolescents to help withstand peer pressure in initiating sexual activity. Pregnancy prevention programmes to encourage contraceptive use are imperative.