The television series Lost has 121 broadcast episodes.
Those episodes aired across six seasons on ABC from September 22, 2004, through May 23, 2010. The series used a mixture of regular episodes, two-part stories, and extended season premieres or finales, which can make episode totals appear different in some listings.
Lost’s episode structure was especially distinctive because many stories were built around flashbacks, flash-forwards, and later time shifts. These narrative devices allowed the show to reveal characters’ histories while gradually expanding the island mythology.
A frequent source of confusion is the way the finale is counted. “The End” was broadcast as an extended concluding event, but episode guides generally count the series at 121 episodes. International schedules and streaming platforms may divide or combine two-part installments differently without changing the standard total.