Feletheus (also known as Feva, Feba, Foeba, Fevva, Fevvanus, Theuvanus; died 487) was the king of the Rugii from 475 to 487.
Feletheus was married to the Goth Gisa, who was probably the cousin of the Amal Ostrogothic king Theodoric the Great.
In 476, Feletheus supported Odoacer and his Scirian and Herulian allies in the overthrow of the Roman Emperor Romulus Augustus.
Odoacer subsequently invaded the Kingdom of the Rugii, utterly defeating them at a battle near present-day Vienna.
Two years later, under his son Frideric, the Rugii joined the Ostrogothic king Theodoric the Great, who invaded Italy and defeated and murdered Odoacer in 493.