HOS may refer to: Military Croatian Armed Forces (Independent State of Croatia) (Croatian: ), active during World War II Croatian Defence Forces (Croatian: ), the military arm of the Croatian Party of Rights (1991–1993) Sports Croatian Volleyball Federation (Croatian: ) 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 See also Ho (disambiguation) Hoss (disambiguation)