The present study is part of the WHO/SUPRE-MISS conducted in Iran. The aim of the study was to determine the lifetime prevalence of suicide behaviors in a community sample of Iranian adults. Five hundred and four families were selected randomly according to electricity bills in Karaj, 45 km from the capital city, represented the catchment area for this investigation. The SUPRE-MISS questionnaires used in this study compromised a variety of aspects of suicidal behaviors. Lifetime prevalence rates for suicidal ideation, planning and attempts were 14%, 6.6%, and 4.1% respectively. Tobacco users and long-term mental and physical disabilities were significantly higher among subjects with a history of suicidal attempts. Younger ages, tobacco abuse, and long-term mental or physical disabilities could be considered risk factors for attempting suicide.