Backstreet Boys (often abbreviated as BSB) is an American vocal group consisting of Nick Carter, Howie Dorough, AJ McLean, and cousins Brian Littrell and Kevin Richardson. They were formed in 1993 in Orlando, Florida.

The group rose to fame with their international debut album, Backstreet Boys (1996). In the following year, they released their second international album Backstreet's Back (1997), along with their self-titled U.S. debut album, Backstreet Boys (1997), which continued the group's success worldwide. They rose to superstardom with their third studio album Millennium (1999), anchored by the worldwide hit "I Want It That Way", and its follow-up album, Black & Blue (2000). They also released a greatest hits album, The Hits – Chapter One (2001). After a two-year hiatus, they regrouped and released a comeback album, Never Gone (2005). After the conclusion of the Never Gone Tour in 2006, Richardson left the group to pursue other interests. The group then released two albums as a quartet: Unbreakable (2007) and This Is Us (2009).

Richardson permanently rejoined the group in 2012. In the following year, they celebrated their 20th anniversary and released their first independent album, In a World Like This. Their follow-up album DNA (2019) debuted at number one, more than two decades after the group formed and 19 years after they last topped in 2000. They also became the first boy band to top the U.S. album charts in three different decades. In 2022, they released their first Christmas album, A Very Backstreet Christmas. They celebrated their 30th anniversary on April 20, 2023.

The Backstreet Boys have sold over 100 million records worldwide, making them the best-selling boy band of all time, and one of the world's best-selling music artists. They are the first group since Led Zeppelin to have their first ten albums reach the top 10 on the Billboard 200, and the only boy band to do so. The albums Backstreet Boys and Millennium were both certified diamond by the Recording Industry Association of America (RIAA), making them one of the few bands to have multiple diamond albums.

The group received a star on the Hollywood Walk of Fame on April 22, 2013 (2 days after their 20th anniversary). They released a documentary film, titled Backstreet Boys: Show 'Em What You're Made Of in January 2015. In March 2017, the group began a concert residency in Las Vegas that lasted two years, titled Backstreet Boys: Larger Than Life.