Open Educational Resources (OER) and renewable assignments that create OER are closely related and promote access to knowledge, collaboration, and community engagement. Through both, PhD students can contribute to the advancement of open education while enhancing their own learning and professional development. Despite many advantages, OER and renewable assignments are widely underutilized in U.S. institutions of higher education. To enhance nationwide adoption, PhD programs may be an important context for using and creating OER because many PhD students will become faculty members in the future. This survey research collected data from April to December 2022 to explore the prevalence and perceptions of OER and renewable assignments among the 72 PhD programs in the top 100 ranked social work programs in the United States. Thirty of the 72 programs were represented in the sample. Most of the respondents (68%) reported using OER materials in at least one course, with audiovisual and textbooks the most reported type of OER used. In contrast, a few (6%) of the respondents reported their programs used renewable assignments. Lack of knowledge or awareness was the most commonly cited reason for not adopting OER or renewable assignments. Representatives from programs that had adopted OER had higher perceptions of positive student impact from OER use or creation than those from programs that had not adopted OER (Mann Whitney U = 61.0, p = 0.058). Our findings indicate a reasonably widespread adoption of OER as course materials in social work PhD programs in the United States. There is an opportunity for increased adoption of renewable assignments to both create suitable, high quality OER materials for use in social work PhD programs and to train future social work faculty in the logistics of creating and using OER.