A study was conducted to ascertain correlates of HIV high risk behaviors and attitudes toward HIV. A questionnaire was administered to 103 men living in a modified therapeutic community (TC) for homeless, chemically addicted and mentally ill men. The psychiatric diagnoses of the sample population included psychotic disorders (48%), depressive disorders (36%), and bipolar disorders (16%). Forty-two percent reported that their primary substance of abuse was cocaine and another 40% named alcohol as the substance to which they were most addicted. Two logistic regression analyses were conducted, one with needle sharing as the outcome measure and one with endorsement of the need for lifestyle changes to reduce risk of HIV transmission. Cocaine users were 3.4 times more likely to have shared needles than the rest of the sample. Patients who had a history of sexually transmitted diseases (STDs) were 17 times more likely to endorse the need for lifestyle changes. The level of HIV transmission knowledge was unrelated to HIV risk behaviors or attitudes.