This study examines social and behavioral factors associated with condom use among female commercial sex workers (CSWs) in Tarlac, the Philippines. One hundred and twenty-one CSWs who visited a social hygiene clinic for regular check-ups were asked to fill out a self-administered questionnaire with thirty-one items. More than 80% of the respondents had experience of using condoms with clients. However, only 48% of them used consistently. Six factors, level of education, knowledge of condom application, knowledge of condom effectiveness for preventing AIDS, knowledge of AIDS, use of other contraceptives, and sex premise managers' advice about using condoms, were significantly associated with their condom use by bivariate analyses. Following a logistic regression analysis, three variables, education, knowledge of condom effectiveness, and sex premise managers' advice, were revealed to be independently associated with consistent condom use. We recommend that managers of sex premises take an active role in advocating condom use, and that the effectiveness of condoms as an AIDS preventative be emphasized in future educational and interventional programs.