Miles Prower (マイルス・パウアー, Mairusu Pauā), better known by his nickname Tails (テイルス, Teirusu), is one of the main characters in the Sonic the Hedgehog series of video games, comics, and animated series. His signature trait is that he is able to fly through the air, using his twin tails like a helicopter.

The name "Miles Prower" is a pun on "miles per hour", a reference to the famed speed of the Sonic the Hedgehog series. He is an 8-year-old orange-yellow, anthropomorphic fox with two tails (similar to the mythological kitsune), hence his nickname.

Once described as being Sonic's 'cute kid brother', Tails is known to be Sonic's best friend, sidekick, and an expert mechanic. His debut was on October 16, 1992, introduced in Sonic the Hedgehog 2.