Autism spectrum disorder (ASD) is currently one of the most researched of all childhood developmental disorders and is receiving attention in many domains. The purpose of this study was to design and provide psychometric evidence for a scale that measures police officer self-efficacy for working with individuals with ASD. Psychometric properties of a scale designed to measure knowledge of ASD were also explored. Data from 620 police officers were collected and a 13-item scale was created and evaluated. Results indicated that the scale represented a unidimensional construct. Knowing more about officers' knowledge and beliefs in their own capabilities to work with individuals with ASD can help inform future police education and training efforts.