Objective: This article describes the development and validation of the Religious/Spiritually Integrated Practice Assessment Scale (RSIPAS). The RSIPAS is designed to assess social work practitioners' self-efficacy, attitudes, behaviors, and perceived feasibility concerning the assessment or integration of clients' religious and spiritual beliefs in clinical practice. Methods: After establishing content validity of the RSIPAS with a group of nationally known experts in the area of religion/spirituality and behavioral health, a national sample of master's social workers (N = 482) was randomly selected to assess the scale's internal consistency, criterion validity, discriminant validity, and factorial validity. Results: Findings support the scale's reliability (a = 0.95), criterion validity, discriminant validity, and factorial validity. Conclusions: The RSIPAS may be a useful instrument for elucidating current views and training needs among social work practitioners or to evaluate the outcomes of training or educational programs that provide content on religion and spirituality in the practice context.