Purpose: To explore associations of self-reported condom use with sexual risk knowledge and behaviors, perceptions of peer condom use, and communication with sexual partners about condom use among adolescent girls with sexually transmitted diseases (STDs). Methods: Adolescent girls with cervicitis or pelvic inflammatory disease (PID) completed a 62-item self-administered questionnaire on sexual risk knowledge and behaviors, condom use, perceptions of peer condom use, and condom use negotiation with partners. Associations with frequency of condom use and condom use at last sexual intercourse were analyzed. Results: A total of 24 girls were enrolled: 13 with cervicitis and 11 with PID; 22 had complete data for analysis. Compared with girls who reported low frequency of condom use, girls who reported condom use all or most of the time were younger (16.7 vs. 19.5 years; p = .008), were less likely to have a prior history of STD (67% vs. 0%; p = .03), and were more likely to think that all or most of their friends use condoms (72% vs. 0%; p = .02). Compared with girls who had not used a condom with last sexual intercourse, girls who had used a condom were younger (16.2 vs. 17.9 years; p = .04), had fewer lifetime partners (2.7 vs. 8.4; p = .03) and had higher mean scores in condom use negotiation (29.1 vs. 24.4; p = .02), and were more likely to think that all or most of their friends used condoms (100% vs. 31%; p = .001). Knowledge about condoms and STD prevention was high (mean 14.3 +/- 2.3 of 16) but was not associated with condom use. Conclusions: STD interventions for partner condom use among high-risk adolescent girls must recognize the decrease in condom use with increasing age and focus on maintaining safer sex behaviors, building condom use negotiation skills, and promoting the perception of condom use by friends. (C) Society for Adolescent Medicine, 1999.