The aim of this study was to develop and evaluate the Gambling and Gambling Problem Perception Questionnaire (GGPPQ) as a measure of healthcare professionals’ attitudes towards people with gambling problems. The researchers held 12 workshops targeted at healthcare professionals who consult people with gambling problems in Japan. Participants completed the GGPPQ and other questionnaires before the workshop. The researchers found that the GGPPQ was associated with participants’ self-ratings of their knowledge of and confidence in supporting people with gambling problems. The GGPPQ was also associated with frequency of consulting people with gambling problems and past experience of attending workshops on problem gambling. These results suggest that the GGPPQ is a valid measure of healthcare professionals’ attitudes.