Madison Grant was an American lawyer, writer, and zoologist known primarily for his work as a eugenicist and conservationist. As a eugenicist, Grant was responsible for one of the most famous works of scientific racism, and played an active role in crafting strong immigration restriction and anti-miscegenation laws in the United States.

As a conservationist, Grant is credited with the saving of many different species of animals, founding many different environmental and philanthropic organizations and developing much of the discipline of wildlife management.