Tuberculosis (TB) and Human Immunodeficiency Virus (HIV) co-infection form a very serious public health menace in Nigeria. Among patients confirmed to have been infected with either of the disease, co-infection with the other is highly prevalent. However, comprehensive studies focusing on the distributions and correlates of TB/HIV co-infections among patients attending TB clinics in Ibadan are lacking in the literature. The objective of this study was to determine the prevalence and correlates of TB/HIV co-infection among patients suspected to be TB positive at various health facilities offering TB/HIV Collaboration Service (THCS) in Ibadan. A descriptive cross-sectional study was carried out among 500 TB/ HIV clinic attendees in Ibadan, Nigeria.