The Harm Reduction Community Linkages Project is to support capacity building at harm reduction organizations statewide to expand their client base and develop more comprehensive linkages to prevention, treatment, and harm reduction services for individuals with opioid use disorder (OUD), including prescription opioids as well as illicit drugs such as heroin. This project is funded through the Centers for Disease Control and Prevention (CDC) Overdose Data to Action – States (OD2A-S) Cooperative Agreement and Illinois General Revenue Funds. Organizations selected for this funding will need to demonstrate success in engaging individuals with opioid use disorder (OUD), including prescription opioids as well as illicit drugs such as heroin; have experience in linking individuals to opioid use prevention, OUD treatment and injection harm reduction services through community referral networks; and show capacity to cover large geographic regions in Illinois focusing on communities that demonstrate a high burden of opioid overdose. These funds will be used to strengthen partnerships between injection harm reduction community stakeholders and providers of OUD treatment and other needed social services to improve local coordination, connect more individuals to the appropriate support services and treatment for OUD, and provide case management as needed among persons who use opioids.