This article looks at the benefits of green (and blue space). Attention is given to the benefits that green (and blue) space provide to both physical and mental health, and the factors, such as accessibility, gender, and socio-economic status, that influence the benefits green (and blue) space are able to provide. While the findings in the literature are notoriously mixed, this review concludes by providing some tentative suggestions on considerations for the future development of green (and blue) space.