Peacock Eel
Macrognathus siamensis
- Least concern
- Card rarity: Common
- Fish

Macrognathus siamensis, the peacock eel or spotfin spiny eel, is a spiny eel found in freshwater habitats throughout Southeast Asia. They are commercially important as food and aquarium fish.
Classification
- Class
- Actinopterygii
- Order
- Synbranchiformes
- Family
- Mastacembelidae
- Genus
- Macrognathus