Freestyle wrestling is a form of amateur wrestling that is practiced throughout the world. Along with Greco-Roman, it is one of the two styles of wrestling contested in the Olympic games. It is, along with track and field, one of the oldest sports in history. American high school and college wrestling is conducted under different rules and termed collegiate wrestling.

Freestyle wrestling, like its American counterpart, collegiate (also known as scholastic or folkstyle) wrestling, has its origins in catch-as-catch-can wrestling and both have the prime victory condition of the wrestler winning by pinning his opponent on the mat. Freestyle and collegiate wrestling, unlike Greco-Roman, also both allow the use of the wrestler's or his opponent's legs in offense and defense.

According to the International Federation of Associated Wrestling Styles (FILA), freestyle wrestling is one of the four main forms of amateur competitive wrestling that are practiced internationally today. The other three forms of wrestling are Greco-Roman, grappling (also called submission wrestling), and sambo.