Lost Demos by Linkin Park is a 14-track compilation of fully realized songs and works in progress that were recorded before and during the sessions for their landmark second album Meteora. Lost Demos was included on CD in the limited edition Meteora 20th Anniversary Edition Super Deluxe Box Set. It has never been released on vinyl.

Although the release title includes the word demos, the first three tracks are songs that were completed during the Meteora recording sessions but were not included on the final album.