This report examines online gambling harms experienced by people with mental health problems. The report highlights the large proportion of people with mental health problems who experience financial, mental, and interpersonal harms as a result of online gambling. It recognizes that common mental health symptoms can affect why people gamble, lose control, and their ability to cut down. The report also highlights factors that contribute to online gambling harms, such as gambling to cope with mental health problems. Online advertisement and marketing are also noted as a driver of online gambling harms. Other factors of online gambling harm include ease of spending and the design of online gambling games. Lack of resources and difficulty seeking help also contribute to online gambling harms. The report concludes with specific recommendations made to various stakeholders including gambling operators and regulators, internet providers, and financial institutions.