HOS

HOS may refer to:

Military

 * Croatian Armed Forces (Independent State of Croatia) (Croatian: Hrvatske oružane snage), active during World War II
 * Croatian Defence Forces (Croatian: Hrvatske obrambene snage), the military arm of the Croatian Party of Rights (1991–1993)

Sports

 * Croatian Volleyball Federation (Croatian: Hrvatski odbojkaški savez)
 * Head of the Schuylkill Regatta, in Philadelphia, Pennsylvania, United States

Other uses

 * Book of Hosea, part of the Hebrew Bible
 * Head of state
 * Hearts of Space, an American radio program
 * Hellenic Ornithological Society
 * Heroes of the Storm, a multiplayer online video game
 * Higher-order statistics
 * Holt–Oram syndrome, an autosomal dominant disorder
 * Home Ownership Scheme, Hong Kong
 * Hornbeck Offshore Services
 * Hours of service, U.S. regulations governing working hours of commercial vehicle operators
 * House of Staunton, an American chess equipment manufacturer
 * Humanistische Omroep, a Dutch broadcaster
 * Saigon Sign Language (ISO 639-3:hos)
 * Sikorsky HOS, a helicopter
 * Hekscher-Ohlin-Samuelson model, an extension of the Heckscher–Ohlin mathematical model of international trade

Places

 * Hostomel Airport