Social workers are well-positioned to identify people who are experiencing gambling problems before they develop gambling disorder. But social workers often do not have the training or knowledge to do so effectively. This study examined the current state of gambling-related knowledge of social workers. The researchers surveyed 1,777 social workers, who were primarily licensed in the State of New Jersey, USA. Social workers were asked 23 knowledge questions about gambling, gambling disorder, and associated symptoms. On average, participants answered less than half of the knowledge questions correctly. Participants who had practiced in the field of social work for 8 to 15 years, were employed in substance use treatment facilities or universities, and/or had training in gambling treatment answered more questions correctly.