TC or tC could refer to:
- The Combine, a defunct Black team alliance formed as result of a merger between Principality of Zeon and \m/ in 2011.
- The Confederacy, a defunct Brown team alliance formed out of the ashes of the Northern Treaty Organization/Elitist Global Superstructure incident. On April 24, 2008 they merged with the New Order of Independence to form Carpe Diem.
- Trilateral Commission, a defunct Black team alliance which merged into the Circle of Icarus on July 29, 2009.
- The Coalition, a defunct Red team alliance.
- The Conclave, a defunct Multi-Colored alliance.
- The Continuum, a large defunct MDoAP bloc of 12 alliances, 6 of the 12 alliances were sanctioned alliances and several former signatories of the World Unity Treaty.
- Terra-Cotta Pact, a defunct brown sphere MDP bloc
- Trade circles, groups of nations that trade for various reasons, mainly economic.
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