In order to address HIV infection among college students, a comprehensive measure is needed that can be used with samples from culturally diverse populations. Therefore, this paper assessed the reliability and validity of an HIV/AIDS questionnaire that measures fours dimensions of HIV/AIDS awareness--factual knowledge, prejudice, personal risk, and misconceptions about HIV transmission, and will enable cross-cultural research. The International AIDS Questionnaire-Chinese Version (IAQ-C) was developed and validated by Davis, Tang, Chan, and Noel (1999) for use with Chinese populations. In this study, the validity and reliability of the International AIDS Questionnaire-English Version (IQA-E) was assessed on a sample of English-speaking college students from the United States (N = 200) and Australia (N = 74). The results of the CFA supported the four-factor model, and the normative data show patterns similar to previous research. The total IAQ-E had a high internal consistency (Cronbach's alpha = 0.88). The Cronbach's alphas for the sub-scales were 0.87 (myths), 0.81 (attitudes), 0.66 (personal risk), and 0.40 (facts). A 2-week test-retest reliability study on a sub-sample of 32 students revealed a Pearson product-moment correlation coefficient of 0.882 (p less than 0.001). This instrument provides a valid and reliable comprehensive measure of HIV/AIDS for use with English-speaking samples. (Contains 4 tables.)