This review looks at the relationship between gambling and homelessness. Gambling in the homeless population is quite prevalent. The relationship is bi-directional. This means that homelessness can be a risk factor for gambling or a consequence of gambling. In many cases, poverty seems to increase the likelihood of gambling, because for people with low socio-economic status backgrounds, even a small win may change their life for the better. Knowing this, services could identify gambling issues in homeless populations and provide appropriate support.