Self-disclosure of HIV infection to current sexual partners was examined in 138 seropositive men, mostly lower income Hispanics, from Los Angeles. Forty-five percent had been sexually active since learning their serostatus. Of these, 52% had kept their infection secret from one or more partners. The likelihood of disclosure decreased in direct proportion to the number of partners. Nondisclosure occurred in conjunction with unprotected receptive and insertive anal intercourse. Potential factors promoting nondisclosure are discussed.