Men who have sex with men (MSM) bear a disproportionate burden of the Human Immunodeficiency Virus (HIV) epidemic in Canada, and HIV incidence appears to be rising among Canadian MSM (1). MSM comprised nearly half (44.1%) of new positive HIV tests in 2009 (2). Among MSM in Ontario, from 2001 to 2006, HIV diagnoses increased 26% (3). Given the alarmingly high HIV prevalence rates among MSM in North American cities, there is a critical need for HIV prevention interventions for MSM in Canada. Social anxiety, or anxiety about being evaluated in interpersonal situations, is a reliable risk factor for unprotected anal intercourse (UAI) among MSM (4 and 5). Social anxiety is highly modifiable via cognitive-behavioural therapy, a form of psychotherapy (6). Social anxiety may also increase substance use in sexual situations, which is another risk factor for HIV among MSM (7 and 8). As such, an empirically-based social anxiety treatment may also reduce HIV risk behaviours among MSM. The present study will provide Phase I trial data for a novel and innovative HIV prevention intervention for MSM. This is a proposal to test a novel integrated HIV prevention intervention that combines empirically supported treatments for social anxiety with HIV risk reduction counseling to reduce HIV sexual risk behaviour.