Reissue of RFA-MH-20-401.This Funding Opportunity Announcement (FOA) supports pilot work for subsequent studies testing the effectiveness of strategies to deliver evidence-based mental health services, treatment interventions, and/or preventive interventions (EBPs) in low-resource mental health specialty and non-specialty settings within the United States. The FOA targets settings where EBPs are not currently delivered or delivered with fidelity, such that there are disparities in mental health and related functional outcomes (e.g., employment, educational attainment, stable housing, integration in the community, treatment of comorbid substance use disorders, etc.) for the population(s) served. Implementation strategies should identify and use innovative approaches to remediate barriers to provision, receipt, and/or benefit from EBPs and generate new information about factors integral to achieving equity in mental health outcomes for underserved populations.