Adolescents and young adults who have sexual intercourse without using a condom open themselves to the risk of contracting and transmitting HIV/AIDS. Their nonuse of condoms is therefore a health-risking behavior which needs to be addressed. Individual self-efficacy influences one's condom use. Findings are reported from a study conducted to test the psychometric properties of an adolescent and young adult condom self-efficacy scale. A convenience sample of 209 participants, aged 13-26 years of mean age 20 years, voluntarily completed a scale of 19 items developed based upon a review of the literature and a review by experts in adolescents' and young adults' condom use. Item analysis was conducted and 5 items were deleted. Principal axis factor analysis with varimax rotation yielded communication abilities related to condom use, consistent condom use abilities, and correct condom use abilities as factors accounting for 42% of the observed variance. The alpha coefficient was 0.85 for the total scale. This scale could be used to assess perceived condom self-efficacy and to evaluate the effectiveness of strategies to increase perceived condom self-efficacy among adolescents and young adults.