The Adaro were malevolent merman-like sea spirits found in the mythology of the Solomon Islands.

Adaro is a unique creature that lived in the Pacific Ocean. The Adaro is very dangerous. Said to arise from the wicked part of a person's spirit, which is divided between the Aunga (good) which dies, and the Adaro (evil) which stays as a ghost. An adaro is described as a man with gills behind his ears, tail fins for feet, a horn like a shark's dorsal fin, and a swordfish or sawfish-like spear growing out of his head. They may also travel in waterspouts and along rainbows and are said to kill unwary fishermen by firing flying fish at them. Adaros are said to live in the sun and travel back and forth to Earth by sliding along rainbows. They also travel via sun showers and waterspouts.