There is growing evidence about illicit use of buprenorphine in the U.S. The study aims to: (1) identify prevalence and predictors of illicit buprenorphine use in a community sample of 396 young adult (18-23 years old) non-medical users of pharmaceutical opioids and (2) describe knowledge, attitudes and behaviors linked to illicit buprenorphine use as reported by a qualitative sub-sample (n=51).