Two-lined Night Adder
Causus bilineatus
- Least concern
- Card rarity: Common
- Reptiles

Causus bilineatus is a species of venomous snake in the subfamily Viperinae of the family Viperidae. The species is native to southcentral Africa. There are no subspecies that are recognized as being valid.
Classification
- Class
- Reptilia
- Order
- Squamata
- Family
- Viperidae
- Genus
- Causus