They Might Be Giants, often abbreviated as TMBG, is an American alternative rock and children's band formed in 1982 by John Flansburgh and John Linnell. During TMBG's early years, Flansburgh and Linnell frequently performed as a musical duo, often accompanied by a drum machine. In the early 1990s, TMBG expanded to include a backing band. The duo's current backing band consists of Marty Beller, Dan Miller and Danny Weinkauf. They have been credited as vital in the creation and growth of the prolific DIY music scene in Brooklyn in the mid-1980s.

The group has been noted for its unique style of alternative music, typically using surreal, humorous lyrics, experimental styles and unconventional instruments. Over their career, they have found success on the modern rock and college radio charts. They have also found success in children's music with several educational albums and in theme music for television programs and films.

TMBG have released 23 studio albums. Flood has been certified platinum, while their children's music albums Here Come the ABCs, Here Come the 123s, and Here Comes Science have all been certified gold. The duo has been nominated for four Grammy Awards, winning two. Flansburgh and Linnell won for writing "Boss of Me", the theme to Malcolm in the Middle (Best Film or Television Theme) and They Might Be Giants won for Here Come the 123s (Best Children's Album). Linnell and Flansburgh were also nominated for a Tony Award for Best Original Score (Music and/or Lyrics) Written for the Theatre along with other composers of the show for SpongeBob SquarePants: The Broadway Musical. In total, the group has sold over 4 million records.