Colossus (real name Piotr Nikolaievitch Rasputin) (Пётр Николаевич Распутин), often going by the Americanized name Peter Rasputin, is a fictional character and superhero from Marvel Comics, appearing as a major character in the X-Men comics.

He is of Russian heritage and is the brother of the magic-based heroine Magik as well as the villainous Mikhael Rasputin. Despite his mutant abilities of superhuman strength and organic-steel skin, he is actually a kind and gentle figure, who's also is a talented artist.

He was created by the late Len Wein and the late Dave Cockrum, and first appeared in Giant-Size X-Men #1 in May of 1975.

Since his debut in the comics, Colossus has appeared in numerous media over the years. In the X-Men movies, he was portrayed by Donald Mackinnon, Daniel Cudmore, and voiced by Stefan Kapičić.