Blink-182 (also referred to as the untitled album) is the fifth studio album by American rock band Blink-182, released on November 18, 2003, by Geffen Records. Following their ascent to stardom and success of their prior two releases, the trio was compelled to take a break and participated in various side projects (Box Car Racer and Transplants). When they regrouped, they felt inspired to approach song structure and arrangements differently on their next effort together.

Recorded from December 2002 to September 2003 with producer Jerry Finn, the album has been described as darker and more mature than the band's earlier work. It also marked a musical departure from their previous efforts, infusing experimental elements, inspired by lifestyle changes (the band members all became fathers before the album was released) and side projects, into their usual pop-punk sound. Its songs are sonically expansive and downcast, leading critics to view it as a more elaborate, mature side of the band. The songwriting is more personal in nature and explores darker territory, touching upon the realities of adulthood and unexpected hardships. In addition, its recording process was long and often unconventional.

Fans were generally split regarding the band's "new" direction, but the album proved successful, selling 2.2 million copies in the United States. It received positive reviews, with critics welcoming its change in tone. Lead singles "Feeling This" and "I Miss You" received the most radio airplay out of the four singles released, and peaked high on Billboard charts. The worldwide touring schedule, which saw the band travel to Japan and Australia, also found the three performing for U.S. military troops stationed in the Middle East. The album was the band's last recording with longtime producer Jerry Finn and their final original material before a four-year-long hiatus. It is also their longest studio album to date, clocking in at 49 minutes.