"Castle of Glass" is a song written by American rock band Linkin Park for their fifth studio album, Living Things. The song was produced by co-lead vocalist Mike Shinoda and Rick Rubin. The song was released as a promotional single for Danger Close Games's 2012 release, Medal of Honor: Warfighter, as with Linkin Park's previous contribution to the Medal of Honor series, "The Catalyst". The single was released on February 2, 2013 in physical format and on March 22, 2013 it was released as a digital single on iTunes.

A Mike Shinoda remix is featured on Linkin Park's second remix album, Recharged. The remix version is also featured in the video game Need for Speed Rivals as part of the soundtrack.

"Castle of Glass" uses electronic elements from the band's previous studio album, A Thousand Suns.Loudwire noted in their Living Things review that the song features "very different electronic elements and unique sounding samples that the band have added to their musical palette." Yet is one of the most direct that the band has done, with a traditional song structure and a melody reminiscent of country music.

"Castle of Glass" has received mixed to positive reviews from critics. Billboard wrote in their review of Living Things, "A folk song with LP's muscle, "Castle of Glass" uses compelling songwriting, extended metaphors and a simple but radical (for Linkin Park) arrangement to offer one of the album's most intriguing tracks." A staff reviewer at Sputnikmusic wrote in their mixed review of Living Things that the song sounded too similar to "Powerless" and that the song "would have been better if it wasn’t inferior to the similar sounding final track." AltSounds described "Castle of Glass" in their album review as "a drawn-out filler track that keeps to a crawling pace, is strangely passive and doesn’t leave you feeling very inspired." The song was nominated for the "Best Song in a Game" award at the 2012 Spike Video Game Awards.

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