The Phaya Naga (; ) are naga, mythical serpent-like creatures, believed by locals to live in the Mekong river or estuaries. Some have tried to explain sightings as oarfish, elongate fish with red crests; however these are exclusively marine and usually live at great depths. People in both Laos and Thailand attribute the naga fireballs to these creatures.

The Phaya Naga (; ) are naga, mythical serpent-like creatures, believed by locals to live in the Mekong river or estuaries. Some have tried to explain sightings as oarfish, elongate fish with red crests; however these are exclusively marine and usually live at great depths. People in both Laos and Thailand attribute the naga fireballs to these creatures.