"Stressed Out" is a song written and recorded by American musical duo Twenty One Pilots, for their fourth studio album, Blurryface (2015). Written by Tyler Joseph and produced by Mike Elizondo, the lyrics discuss the harsh end of adolescence and the transition to adulthood. The song was released as a promotional single on April 28, 2015 on the Google Play Store and Amazon, and was issued to top 40 radio stations as the albums fourth official single on November 10.

"Stressed Out" was a sleeper hit that reached number two on the US Billboard Hot 100, and number one on Hot Rock Songs and Mainstream Top 40. It is tied with "Heathens" as the duo's highest ranking single to date. "Stressed Out" has received two Grammy Awards nominations: Record of the Year and Best Pop Duo/Group Performance.Billboard ranked "Stressed Out" at number 62 on their "Billboard's 100 Best Pop Songs of 2016" list. As of December 2016, it has sold over 2.4 million copies in the US.

The song focuses on nostalgia for childhood, the pressure of adulthood, and family relationships, it speaks from the point of view of "Blurryface", the album's title character. The line, "My name's Blurryface, and I care what you think" is heard in the pre-chorus, alluding to marketing the duo did for the album.

The vocals in the song span from E₃ to A₄.

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