Find 815 is the second alternate reality game (ARG) for the American Broadcasting Company's serial drama television series Lost. It began on December 28, 2007 and concluded on January 31, 2008 with the premiere of the fourth season of Lost. The free registration ARG follows Oceanic Airlines IT technician Sam Thomas as he investigates the whereabouts of Oceanic Flight 815, on which his girlfriend Sonya was a flight attendant. Of the 324 people on board the flight, seventy-one survived and they serve as the characters of Lost. Lost previously hosted an ARG during the hiatus between the second and third seasons called the Lost Experience. Find 815 was produced by digital entertainment company Hoodlum and ABC.
On December 28, 2007, ABC's press website (ABC Medianet) uploaded a press release announcing the return to business of the fictitious Oceanic Airlines. The release contained a phone number, which when called, instructs the listener to visit http://www.flyoceanicair.com, which features a commercial for Oceanic. On December 31, the site was updated with a video of Sam explaining his situation intercut with flashes of the URL http://www.find815.com. The official Find 815 website contains more videos of Sam as he begins to uncover the truth of what happened to 815.
At Sydney Airport, the Seven Network placed a billboard near the exit, featuring a picture of an Oceanic Airlines hostess and the company's symbol with the words "find815.com" 'painted' over the company's name.