Introduction: Human immunodeficiency virus/acquired immune deficiency syndrome (HIV/AIDS) is a chief cause of death in sub-Saharan Africa. In this study, the clinical characteristics and predictors of mortality among hospitalized HIV infected adult Nigerians are reported. Methodology: The records of 354 patients were reviewed for demographic and clinical characteristics. Predictors of mortality using logistic regression in a retrospective study were also reviewed. Results: A total of 109 (30.8%) males and 245 (69.2%) females participated in the study. The mean age of all participants was 35 ± 8 years. Median baseline CD4 cell counts and viral load were 91 cells/mm³ and 63,438 copies/ml respectively. There was a total of 123 (34.8%) deaths while 231 (65.2%) patients were discharged home. Tuberculosis (TB) was the most common diagnosis on admission as well as the leading cause of death. Among all subjects, only male gender (adjusted odds ratio [AOR]