Third party may refer to:

• Third-party source, a supplier company not owned by the buyer or seller
• Third-party beneficiary, a person who could sue on a contract, despite not being an active party
• Third-party insurance, such as a vehicle insurance

• Third party (politics), any party contending for votes that failed to outpoll either of its two strongest rivals
  • Third party (U.S. politics), a US political term for parties other than the Democrats or Republicans
• Third party (SIPO), in Ireland, those who receive political donations but do not run for election

• 3rd Party, a 1990s American music group
• Third Party (album), by Blue Sky Black Death and Alexander Chen, 2010
• Third Party (DJs), a British DJ duo
• The Third Party, a 2016 Filipino romantic comedy drama film
• The Third Party (album), a 1989 album by Jules Shear
• The Third Party (webtoon), a thriller romance webtoon

• Third-party software component

• All pages with titles beginning with Third party
• All pages with titles containing third party
• Third person (disambiguation)
• 3P (disambiguation)