Adapting evidence-based interventions for new populations and involving community stakeholders in the adaptation process is important for improving the dissemination and efficacy of interventions aimed to prevent trauma or prevent/treat problems among trauma survivors. Yet, little is known about community stakeholders' involvement during the adaptation process. This systematic review aims to do the following: (a) identify studies applying the ADAPT-ITT model to adapt interventions for preventing trauma or preventing/treating problems among trauma survivors, (b) examine both the presence/absence of community stakeholders' involvement, and (c) identify innovative community stakeholder involvement during application of this model. Six databases were searched for related studies. Data was extracted about community stakeholders' involvement during specific phases of the ADAPT-ITT model that allowed for greater community stakeholder involvement. One phase involves stakeholders providing suggested intervention modifications during what is called a "theater test." Thirty-two studies that described the adaptation of 19 interventions were identified. Most studies involved community stakeholders during the needs assessment and theater tests (83%). Few studies described community stakeholders as sharing decision making about which intervention to use for the new population (18%). Approximately half (44-50%) reported community stakeholders either received training on the adapted intervention or facilitated the adapted interventions during testing phase. Innovative strategies included using community stakeholder advisory boards to guide intervention selection and modifications. Findings suggest the need for improving community stakeholder involvement throughout the application of the ADAPT-ITT model to advance trauma science and provide examples of innovative strategies for doing so. (PsycInfo Database Record (c) 2022 APA, all rights reserved).