Background The spread of HIV/AIDS among the productive age group particularly young adults is a major public health concern in Nigeria. HIV screening services are affordable interventions that offer chances to raise knowledge about HIV and preventive measures. They are crucial parts of HIV prevention initiatives. This study investigated the level of knowledge, and attitude as correlates of intention to Utilize HIV Screening Services Among Adolescents in Selected Secondary Schools in Osogbo, Osun State, Nigeria. Methods Data were collected from 120 respondents who were conveniently selected from two senior secondary school at the two Local government areas in Osogbo, Osun state with semi-structured questionnaire (83% reliability). Data were analyzed using appropriate statistical tools. Results Most of the students were in the middle adolescence (14 – 16 years) age group. The Knowledge responses were grouped on a scale and the results showed that most of the adolescents had a moderate level of knowledge regarding HIV/AIDS and HIV Screening Services. Further results showed a fairly high and positive attitude for the participants (76.66%). There were significant correlations (at p < 0.05) between knowledge level (R = 0.348), attitude (R = 0.432), and Intention to Utilize HIV Screening Services. These factors are still quite modest, though. Additionally, knowledge level indicated that most participants were unaware of any importance of the utilization of HIV Screening services. Conclusions The report suggested launching vigorous campaigns of public health education and awareness that highlight the importance of utilizing HIV Screening services.