Myloplus sauron is a species of fish that is in the family Serrasalmidae.

The fish was discovered alongside Myloplus aylan.

[1] The species of fish is restricted to the Xingu River.

[2][3] The name sauron is named after Sauron, the main antagonist of the fantasy novel The Lord of the Rings.

[2] The naming of the fish is due to the vertical black band on the fish resembling the vertical-pupilled eye of Sauron.