Rates of HIV diagnoses among young Black and Latino sexual minority men (SMM) have continued to increase since 2011; meanwhile, overall rates in the USA have decreased. Despite their importance, academic and medical institutions have often struggled to engage and recruit racial and ethnic minority SMM in HIV prevention services and research. The current study compares the success of two strategies for recruiting racial and ethnic minority SMM. Recruitment occurred in the context of a larger implementation study testing the effectiveness of a substance use and HIV prevention intervention among SMM at high risk for HIV infection. SMM (n = 778) were reached through either (1) field-based outreach conducted by two local community-based organizations (CBOs) delivering the intervention or (2) online recruitment coordinated by the trial's academic research partner. Field-based recruitment reached a significantly larger proportion of Black (42.9% vs. 18.2% reached online) and Latino individuals (40.3% vs. 28.1% reached online). Although online recruitment reached a greater proportion of SMM who met trial eligibility criteria (58.4% vs. 35.3% for field-based outreach; χ(1) = 38.471, p < .001), a greater proportion of eligible participants identified through field-based outreach actually enrolled into the study trial (30.9% vs. 18.8% for online recruitment; χ(1) = 7.82, p < .01). As a result, field-based recruitment required fewer recruitment staff hours (2.62 per enrolled participant) than online recruitment (3.46 recruitment staff hours per enrolled participant). Findings illustrate the potential for field-based, CBO-executed recruitment to reach Black and Latino SMM and for CBOs to successfully enroll those identified as eligible. Future prevention and implementation research should routinely engage community partners in the development of study recruitment strategies in a manner that can inform outreach and marketing efforts for HIV prevention research and prevention. Clinicaltrials.gov = NCT03488914.