Lost originally aired on the U.S. broadcast network ABC.
The science-fiction drama premiered on September 22, 2004, and followed survivors of Oceanic Airlines Flight 815 after the plane crashed on a mysterious island. ABC carried the series throughout its original six-season run, which ended on May 23, 2010. The show ultimately produced 121 episodes.
Lost was developed by Jeffrey Lieber, J. J. Abrams, and Damon Lindelof, with Bad Robot and Touchstone Television among its major production associations. Its network home helped make the series a prominent example of serialized genre television on a major American broadcaster rather than a cable or streaming service.
Viewers sometimes confuse ABC with CBS, Fox, or NBC because those networks also aired major genre and mystery dramas during the same period. ABC is the U.S. network listed for Lost; international broadcasters varied by territory, so the answer refers specifically to its original American transmission.