Season Five of Lost premiered on January 21, 2009. In May 2007 ABC and the producers of Lost announced that the show would be ending after 48 more original episodes. They also announced these episodes would be split across three more seasons of 16 episodes each and that each of those three seasons would air uninterrupted between February and May. 
The WGA strike caused a change to the original plan in that only 14 of the planned 16 hours were produced for season four and it was announced that the two unproduced hours would be distributed between seasons five and six. Season five will have 17 episodes, with the two last being aired on one night as the season finale.
- Gallery: A gallery of the main cast and other recurring guests.
- Mysteries: An overview of the mysteries introduced and explained in the season.
- Season Five Timeline: A chronology of the events that occurred during season five of Lost.
- The DHARMA Initiative: Information about the DHARMA Initiative.
- The Hanso Foundation: Information about the organization that funds The DHARMA Initiative.
- The Widmore Corporation: Information about another mysterious organization that may know about the island.
|87||1||Because You Left||Various||January 21, 2009|
|88||2||The Lie||Hurley||January 21, 2009|
|89||3||Jughead||Desmond||January 28, 2009|
|90||4||The Little Prince||Kate||February 4, 2009|
|91||5||This Place Is Death||Sun / Jin||February 11, 2009|
|92||6||316||Jack||February 18, 2009|
|93||7||The Life and Death of Jeremy Bentham||Locke||February 25, 2009|
|94||8||LaFleur||Sawyer||March 4, 2009|
|95||9||Namaste||Various||March 18, 2009|
|96||10||He's Our You||Sayid||March 25, 2009|
|97||11||Whatever Happened, Happened||Kate||April 1, 2009|
|98||12||Dead Is Dead||Ben||April 8, 2009|
|99||13||Some Like It Hoth||Miles||April 15, 2009|
|100||14||The Variable||Daniel||April 29, 2009|
|101||15||Follow the Leader||Richard||May 6, 2009|
|102||16||The Incident (1)||Jacob||May 13, 2009|
|103||17||The Incident (2)||Jacob / Juliet2||May 13, 2009|
1 Many episodes in Season Five do not have traditional flashforwards or flashbacks. In the first half of the season the off island stories are all still technically flashforwards but follow a continuous timeline across the episodes and in most episodes focus on a single character who is listed in this column (most of the episodes opened with an off island scene set shortly after the rescue of the Oceanic Six as well). In episode nine the original on island timeline jumps three years into the future syncing it up with the off-island timeline from the first half of the season but groups are now in two different time periods (they however experience the same linear progression of time). For the rest of the season scenes from the two time periods on the island are interspersed but most episodes open with a traditional flashback which is listed in this column.
2 In addition to flashback scenes showing Jacob interacting with the survivors, Juliet is given a flashback of her own.
|9||SP9||Lost: Destiny Calls||January 21, 2009|
|10||SP10||Lost: The Story of the Oceanic 6||April 22, 2009|
|11||SP11||Lost: A Journey in Time||May 13, 2009|
|Season 1 | Season 2 | Season 3 | Season 4 | Season 5 | Season 6 | Lost: Missing Pieces|