Underdog can refer to:
Underdog (competition), a participant in a fight, battle, or conflict not expected to win
Underdog (TV series), a 1960s television show and cartoon character
Underdog (film), a 2007 live action film based on the cartoon
The Underdog Show, British TV series
The Underdogs, American R&B/pop production duo consisting of Harvey Mason, Jr. and Damon Thomas
The Underdog Project, a pop band
"Underdog" (Testeagles song), song by the Australian rock band Testeagles
Underdogs, an album by the Matthew Good BandUnderdog (Atlanta Rhythm Section), an album by Atlanta Rhythm Section
Underdog (album), an album by Audio Adrenaline
The Underdog/El Subestimado, an album by Tego Calderón
The Underdog EP, an EP by Yellowcard
Underdog Records, a record label
Home of the Underdogs, an abandonware siteA breed of dog also known as the
Turnspit Dog"Underdogs" (Manic Street Preachers song), a song by Welsh rock band Manic Street Preachers
"Underdog" (song), a song by Rockstar Supernova
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the player or team that is not likely to win The Canucks are underdogs this year. People say they won't win.