Anaconda may refer to:
- Any member of the genus Eunectes, a group of large, aquatic snakes found in South America
- Eunectes murinus, the green anaconda, the largest species, is found east of the Andes in Colombia, Venezuela, the Guianas, Ecuador, Peru, Bolivia, Brazil and Trinidad and Tobago.
- Eunectes notaeus, the yellow anaconda, a smaller species, is found in eastern Bolivia, southern Brazil, Paraguay and northeastern Argentina.
- Eunectes deschauenseei, the dark-spotted anaconda, is a rare species found in northeastern Brazil and coastal French Guiana.
- Eunectes beniensis, the Bolivian anaconda, the most recently defined species, is found in the Departments of Beni and Pando in Bolivia.
- The giant anaconda is a mythical snake of enormous proportions said to be found in South America.
- Any large snake that "crushes" its prey (see Constriction), if applied loosely, could be called anaconda.
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