The present paper focuses on reasons for not taking an HIV-test among untested men who have sex with men (MSM). From an MSM web-based survey, 1627 MSM who had never tested for HIV were selected for the reported analyses. Results show that fear of a positive test result and the perceived consequences thereof, are reported as the most important reasons for not taking an HIV-test among at-risk respondents. The most important reasons for not taking an HIV-test among no-risk respondents are related to perception of low risk for HIV-infection. Implications for future interventions to promote HIV-testing are discussed.