- Category : Mixed Martial Arts
- Type : MGP
- Profile : 1/3 - Investigating / Martyr
- Definition : Single
- Incarnation Cross : RAX Laws 1
Nathan Donald Diaz is an American professional mixed martial artist, currently signed with the Ultimate Fighting Championship. Diaz is the younger brother of former Strikeforce Welterweight Champion, WEC Welterweight Champion, and IFC Welterweight Champion, Nick Diaz.