The Hanso Foundation is a fictional foundation in the Lost television series. It was formed by arms purveyor Alvar Hanso, who turned his attention from "keeping the world safe through the development of sophisticated weapons systems" to focus instead on the development of new technologies to "create a brighter future for all humanity." Nearly all information about the Foundation is drawn from its Web site, thehansofoundation.org, with further background revealed as part of the alternate reality game, the Lost Experience.

The Hanso Foundation, through its funding of the DHARMA Initiative, was involved in the construction of facilities on the island depicted in Lost.