The toolkit builds on the Community Engagement Studio (CES) model and toolkit developed by the Meharry-Vanderbilt Community Engaged Research Core (CERC). The Maternal Mental Health Research Collaborative (MMHRC) tailored the model for researchers and community experts interested in maternal mental health and/or opioid use/recovery to provide focused guidance for engaging these populations. The toolkit provides a comprehensive step-by-step guide to implement the CES model with these populations.