Natrix is a genus of colubrid snakes. They are collectively called grass snakes and water snakes. However, some other snake species known as "grass snakes" and "water snakes" are not of the genus Natrix.
The genus includes:
- Natrix astreptophora – Iberian grass snake 
- Natrix maura – viperine water snake 
- Natrix megalocephala – large-headed water snake (status controversial)
- Natrix natrix – grass snake 
- Natrix tessellata – dice snake 
- Natrix helvetica – barred grass snake 
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