Underbelly is the side of something that is not normally seen. Figuratively, it means a vulnerable or weak part, similar to the term

Achilles' heel An Achilles' heel (or Achilles heel) is a weakness in spite of overall strength, which can lead to downfall. While the mythological origin refers to a physical vulnerability, idiomatic references to other attributes or qualities that can lead to ...

, or alternatively, a hidden, illicit side of society. This term could refer to:

Business

Underbelly Limited Underbelly is a live events producer and venue operator, known as one of the "Big Four" venue operators at the Edinburgh Festival Fringe. From its roots as a Fringe venue, the company has expanded to include a festival on London's South Bank a ...

, an entertainment company in the UK *

Underbelly (venue) The Underbelly is a venue at the Edinburgh Festival Fringe off Cowgate. From 2001-2004, Underbelly was the only venue operated by Underbelly Limited. In 2005, Underbelly added the Baby Belly venue. In 2006, these venues were joined by the E4 U ...

, an entertainment venue in the UK

Television

Australia and New Zealand

* ''Underbelly'' (TV series), an Australian true crime drama television series, that borrows the title of the book series by journalists John Silvester and Andrew Rule and is primarily based on other works by the same authors: ** ''Underbelly'' (series 1), a 2008 Australian television drama mini-series and first in the franchise ** '' Underbelly: A Tale of Two Cities'', a 2009 Australian drama mini-series prequel to the franchise ** '' Underbelly: The Golden Mile'', a 2010 Australian drama mini-series prequel in succession to ''Tale'' ** '' Underbelly: Razor'', a 2011 Australian drama mini-series, fourth in the franchise ** '' Underbelly: Badness'', a 2012 Australian drama mini-series, fifth in the franchise ** '' Underbelly: Squizzy'', a 2013 Australian drama mini-series, sixth in the franchise * ''Underbelly Files'', an Australian drama mini-series trilogy that continues the original ''Underbelly'' series. It consists of four 2-hour length telemovies titled: ** '' Tell Them Lucifer Was Here'', a 2011 Australian made-for-television movie ** ''

Infiltration Infiltration may refer to: Science, medicine, and engineering *Infiltration (hydrology), downward movement of water into soil *Infiltration (HVAC), a heating, ventilation, and air conditioning term for air leakage into buildings *Infiltration (me ...

'', a 2011 Australian made-for-television movie ** '' The Man Who Got Away'', a 2011 Australian made-for-television movie **'' Underbelly Files: Chopper'' a 2017 Australian mini-series * '' Underbelly NZ: Land of the Long Green Cloud'', a 2011 New Zealand spin-off of the Australian series * '' Fat Tony & Co.'', an Australian true crime drama television series and the unbranded sequel to the first series

United States

* ''

Notes from the Underbelly ''Notes from the Underbelly'' is an American sitcom that was aired on ABC from 2007 to 2008, originally debuting as a mid-season replacement. The series is based on the 2005 novel of the same name by Risa Green, and was produced by Eric and Kim Ta ...

'', an American television sitcom

Music

* ''Underbelly'' (soundtrack) {{disambiguation