An anaconda is a large, non-venomous snake found in tropical South America. Although the name applies to a group of snakes, it is often used to refer only to one species in particular, the common or green anaconda, Eunectes murinus, which is one of the largest snakes in the world.
Anaconda may refer to:
- Any member of the genus Eunectes, a group of large, aquatic snakes found in South America
- Eunectes notaeus, the yellow anaconda, a small species, is found in eastern Bolivia, southern Brazil, Paraguay and northeastern Argentina.
- Eunectes deschauenseei, the darkly-spotted anaconda, is a rare species found in northeastern Brazil and coastal French Guiana.
- The giant anaconda is a mythical snake of enormous proportions said to be found in South America.
- Any large snake that "constricts" its prey (see Constriction), if applied loosely, could be called anaconda.