Naja is a genus of snakes commonly referred to as cobras.
Naja may also refer to:
- Robert Del Naja (born 1965), British artist, musician, and founding member of Massive Attack
- Naja Marie Aidt (born 1963), Danish poet and writer
- Najas, a genus of aquatic plants
- Naha, Chiapas, a natural preserve and Mayan village
- Naja, a Navajo design used in Native American jewelry