Medium Rarities is a compilation album by American metal band Mastodon. It was released digitally and on limited edition vinyl on September 11, 2020 via Reprise Records. The album is a collection of rare tracks that include covers, instrumental versions of previous songs, and live recordings. Its opening track, a new song titled "Fallen Torches", was released on July 31, 2020. The song features Scott Kelly from Neurosis for his final guest appearance with Mastodon before his withdrawal from the public eye that was not announced until August 2022.