Gambling is an enjoyable recreational pursuit for many people. However, for some it can lead to significant harms. The Delphi expert consensus method was used to develop guidelines for how a concerned family member, friend or member of the public can recognise the signs of gambling problems and support a person to change their gambling. | How a concerned family member, friend or member of the public can help someone with gambling problems: a Delphi consensus studyHow a concerned family member, friend or member of the public can help someone with gambling problems: A Delphi consensus study