Seaside Dragonlet
Erythrodiplax berenice
- Least concern
- Card rarity: Common
- Insects

Erythrodiplax berenice, commonly known as the seaside dragonlet, is a species of dragonfly in the family Libellulidae. It is found mainly at coastal marshes, mangrove swamps, and alkaline lakes of eastern North America. It is unique among dragonflies of the western hemisphere in that it can breed in seawater.
Classification
- Class
- Insecta
- Order
- Odonata
- Family
- Libellulidae
- Genus
- Erythrodiplax