Background/Objective: Studies have shown that military personnel are aware and knowledgeable about HIV/AIDS and its impact on combat preparedness and efficiency. However, this knowledge did not appear to have translated to reduced risky sexual behaviours. This study, therefore aimed at determining the sexual behaviour and condom use among Nigerian Army personnel in Ilorin, Nigeria. Materials and methods: A descriptive cross-sectional study using a multistage sampling technique to select 400

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... icipants. A pre-tested semi-structured questionnaire was administered. Results: Out of 386 respondents (response rate 96.5%) males constituted 91.2%. Two hundred and seventy two (70.5 %) were married while 42 (15.4%) of the married did not live with their spouses. A significant proportion of the respondents (45.5%), especially those within the age of 18 to 34 years (p=0.000), those who had participated in foreign military operations (p=0.030) and those who did not live with their spouses (p=0.000) engaged in pre/extramarital sexual activities. Regular condom use among the respondents was low. Conclusion/Recommendations: There was a high risky sexual behaviour with irregular condom use among the study population. A continuous information, education and communication on HIV/AIDS to effect safe sex behaviours and regular condom use among this population are recommended.