The following is a list of general spoilers for season 6 of Lost. It is not known specifically which episode each spoiler happens in. When the correct episode is known, the spoiler will be moved to the episode's page.

Former season 6 spoilers and rumors

  • DarkUFO (Spoiler source): As of "What They Died For", Sun, Sayid, Ilana, and Widmore all die.
    • TRUE
  • Damon Lindelof (Co-creator, writer), Carlton Cuse (Writer, producer): Richard and Ilana will exchange words. Some last names have significance. Jack is married to someone we have met before. Someone really is coming to the island. We will learn if Desmond really was on the plane. The Hurley bird and Walt may be seen again.
    • TRUE, all of the definite events have occured.
  • DarkUFO (Spoiler source): Hurley meets someone from Richard's past and relays a message to him in a sad scene. The Man in Black has a true nemesis, and it is not Jacob.
    • TRUE, Hurley meets Richard's wife and the Man in Black's original nemesis was his adoptive mother.
  • DarkUFO (Spoiler source): There are many deaths in the first nine episodes. The Monster "wipes out a lot of people" and "does not like seamen".
    • TRUE
  • Fionnula Flanagan (Eloise Hawking): She will be back for two episodes.
    • TRUE
  • DarkUFO (Spoiler source): Said Taghmoui (Caesar) is returning.
    • FALSE
  • DarkUFO (Spoiler source): Richard is torn, being aided by the Man in Black, but at a price. Aldo, Keamy, Omar, and newcomers Dogen and Lennon are "not long for this world;" some will be killed by a trained soldier. Cindy, Zach, and Emma reappear. Locke and Sawyer literally read crucial writing on a wall. Sawyer stumbles upon a "macabre pile," newcomer Kendall, and a trap. Jack is a father in the alternate timeline, and Claire nearly kills Kate.
  • Kristin Dos Santos (E! Online correspondant): Charlie will appear in three episodes in season 6.
    • TRUE
  • DarkUFO (Spoiler source): Ilana is a main character starting with season 6.
    • TRUE
  • Damon Lindelof (Co-creator, writer): Frank Lapidus is a main character starting with season 6.
    • TRUE
  • Nestor Carbonell (Richard): Richard is finally a main character starting with season 6.
    • TRUE
  • Kristin Dos Santos (E! Online correspondant): Claire is not returning regularly in season 5, but will be back in season 6.
    • TRUE
  • Damon Lindelof (Co-creator, writer), Carlton Cuse (Writer, producer): Season 6 will mirror season 1. Daniel and Juliet will both be involved in the season.
    • TRUE
  • Kristin Dos Santos (E! Online columnist), Michael Ausiello (Entertainment Weekly columnist): Elizabeth Mitchell will not be a main cast member in season 6. Juliet will make several appearances, however.
    • TRUE
  • Damon Lindelof (Co-creator, writer), Carlton Cuse (Writer, producer): We will see how Ethan left DHARMA for the Others.
    • FALSE
  • DarkUFO (Spoiler source): Rousseau and Richard's pasts will be shown. Libby's past with Hurley will finally be revealed.
    • TRUE, Rousseau's past is shown through time travel and Richard's in "Ab Aeterno"; Libby receives closure with Hurley but their connection is not explained.

Former season 5 spoilers and rumors

  • Carlton Cuse (Writer, producer): The person or people who were ultimately responsible for the gassing of the DHARMA Initiative will be seen this season.
    • TRUE, through a chain of events, Kate and Sawyer are technically responsible because they saved Ben's life.
  • DarkUFO (Spoiler source): Casting is going on for a 26 year old Aaron and Ji Yeon for a scene that takes place in 2030.
    • FALSE
  • DarkUFO (Spoiler source): A rumor states that Holland Roden, who played the young Emily Locke in "Cabin Fever," will return for an episode this season for a scene with Richard.
    • FALSE
  • DarkUFO (Spoiler source): The crew is using two large sailing ships, several hundred years old, for a chase scene that likely involves the Black Rock.
    • FALSE, while the Black Rock appears in "The Incident," it is clearly CGI and there is no chase.
  • Doug Hutchison (Horace Goodspeed): He will return for several episodes this season.
    • TRUE
  • Lance Reddick (Matthew Abaddon): He will return an unspecified number of times despite being on Fringe.
    • TRUE
  • Nestor Carbonell (Richard Alpert): He is returning to film new episodes in August, possibly as a regular.
    • TRUE, though he isn't a regular.

Former season 4 spoilers and rumors

  • Damon Lindelof (Co-creator, writer), Carlton Cuse (Writer, producer): Harold Perrineau will be returning to play Michael in season 4.
    • TRUE
  • DarkUFO (Spoiler source): An upcoming episode is called "The Outlier", has Ben flashbacks, and features a math proof called the Jacobian Code. Pre-strike, this episode was going to be episode 9, but has now been pushed to later in season 4.
    • FALSE
  • DarkUFO (Spoiler source): Characters to have flashbacks this season: Alexandra, Rousseau, Locke, Ben, Juliet.
    • FALSE, the Rousseaus never had their flashbacks.
  • DarkUFO (Spoiler source): Locke, Jin, and Sawyer are alive on the island in the future.
    • TRUE
  • DarkUFO (Spoiler source): Scenes with Ben at an airport are being filmed.
    • FALSE

Former season 3 spoilers and rumors

  • Various spoiler sources: Jacob is coming to the island in a week, which is why Juliet needs to be back.
    • FALSE
  • Michael Ausiello (TV Guide columnist): There are not one, not two, but five deaths coming in May. However, these are probably not all main characters.
  • DarkUFO (Spoiler source): The "Door" hatch seen in "Three Minutes" and "Live Together, Die Alone," which supposedly was a facade, actually leads to the island's "magic box."
    • FALSE
  • DarkUFO (Spoiler source): Rousseau appears in all four May sweeps episodes ("The Brig", "The Man Behind the Curtain", "Greatest Hits", and "Through the Looking Glass")
  • Kristin Veitch (E! Online correspondant): There will be a major reveal in every episode from "One of Us" until the end of the season.
    • TRUE
  • Edward Kitsis (Writer), Adam Horowitz (Writer, producer): There will be an incident on the island that will shake up everything we thought about the show.
    • TRUE
  • Damon Lindelof (Co-creator, writer), Carlton Cuse (Writer, producer): Michael and Walt are not returning this season.
    • FALSE, Walt returned.
Season 6 episodes covered by the Lost Spoilers Wiki
LA XWhat Kate DoesThe SubstituteLighthouseSundownDr. LinusReconAb AeternoThe PackageHappily Ever AfterEverybody Loves HugoThe Last RecruitThe CandidateAcross the SeaWhat They Died For
The End (Series Finale)
General SpoilersSpoiler SourcesSeason 6 Episodes
Season 5 episodes covered by the Lost Spoilers Wiki
Because You LeftThe LieJugheadThe Little PrinceThis Place is Death316The Life and Death of Jeremy BenthamLaFleurNamasteHe's Our YouWhatever Happened, HappenedDead is DeadSome Like it HothThe VariableFollow the LeaderThe Incident (Finale)
General SpoilersSpoiler SourcesSeason 5 Episodes
Season 4 episodes covered by the Lost Spoilers Wiki
The Beginning of the EndConfirmed DeadThe EconomistEggtownThe ConstantThe Other WomanJi YeonMeet Kevin JohnsonThe Shape of Things to ComeSomething Nice Back HomeCabin FeverThere's No Place Like Home, Part 1There's No Place Like Home, Part 2 (Finale)
General SpoilersSpoiler SourcesSeason 4 Episodes
Season 3 episodes covered by the Lost Spoilers Wiki
Not in PortlandFlashes Before Your EyesStranger in a Strange LandTricia Tanaka is DeadEnter 77Par AvionThe Man from TallahasseeExposéLeft BehindOne of UsCatch-22D.O.C.The BrigThe Man Behind the CurtainGreatest HitsThrough the Looking Glass (Finale)
General SpoilersSpoiler SourcesSeason 3 Episodes
Community content is available under CC-BY-SA unless otherwise noted.