Public health definitions of gambling-related harm include risks to family members and friends. This scoping review broadly aims to identify recent research on addressing gambling harm to adult affected others, focusing on prevalence, socio-demographic profiles, gambling profiles, and harm (Part I)
and coping strategies, assessment, and treatment (Part II). A systematic search of electronic databases identified 121 studies published from 2000, with 82 focusing on coping strategies (22.3 %), assessment (21.5 %), and treatment (39.7 %). Findings revealed affected others employ various coping strategies, which can be gambler- or family-focussed, before accessing other forms of support. Common strategies include financial strategies and informal support but few studies have assessed their effectiveness. Few brief fit-for-purpose instruments with adequate psychometric evaluation are available to assess affected other status, harm, coping, social support, and help-seeking. Affected others are under-represented in treatment (8 % in general practices, 15 %-26 % in online gambling services, 30 %-43 % in gambling helplines), largely due to various barriers, including a lack of service awareness and shame. Low-intensity internet-delivered interventions show promise and can reach affected others who would not otherwise receive professional help. Other affected other interventions, which can be gambler- and/or family-focused, demonstrate good acceptability but somewhat limited efficacy, while couple interventions demonstrate some promising outcomes, although more rigorous evaluations are needed. The diverse treatment needs and preferences of affected others, coupled with the relatively limited efficacy of current treatments, highlight the need for the development of tailored interventions. The findings of this review can be used to inform clinical, research, and policy decision-making.