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A large number of individuals with co-occurring mental health and substance use disorders do not receive treatment for both simultaneously. The mental health and substance use fields are both experiencing workforce shortages and few providers are trained to provide both mental health and substance use treatment. The focus of this paper is to review current programs/trends that could be useful in increasing the number of providers that can effectively serve individuals with co-occurring disorders (COD) using evidence-based practices. Specific policy recommendations to develop the workforce and more effectively track trends over time are provided.