Oncology social workers are the primary providers of psychosocial care for cancer patients, thus they are well positioned to implement and oversee psychosocial distress screening. A national survey of members of the Association of Oncology Social Work was conducted to examine screening knowledge, attitudes, behaviors, and perceived competency. The findings indicated that most participants screened for psychosocial distress using a standardized instrument and identified institutional and individual barriers to implementing screening. Analyses revealed that social workers who perceived patient benefits from screening and were knowledgeable about guidelines were significantly more likely to implement screening procedures and use a standardized instrument.