TSO may refer to:

Science and technology Transmission system operator, an entity involved in transmission of electric power or natural gas Technical Standard Order, a minimum performance standard issued by the FAA for certain items used on civil aircraft Trichuris suis, a species of whipworm, a parasite of pigs

Computing Total store order, in memory ordering Time Sharing Option, an interactive command line interpreter for IBM mainframe operating systems OS/360, SVS, MVS, OS/390 and z/OS TCP segmentation offloading, a technique for increasing outbound throughput of high-bandwidth network connections

Music Taipei Symphony Orchestra Tasmanian Symphony Orchestra Tehran Symphony Orchestra The Summer Obsession Tokyo Symphony Orchestra Toledo Symphony Orchestra Toronto Symphony Orchestra Trans-Siberian Orchestra Tucson Symphony Orchestra

Transportation Tourist Standard Open, a type of British Railways loco-hauled coach Trailer Standard Open, a type of British Railways coach Marcos TSO, a sports car manufactured by Marcos Engineering Ltd Transportation security officer, a federal employee of the Transportation Security Administration, a division of the U.S. Department of Homeland Security Transaero Airlines, a former Russian airline (ICAO code: TSO) Tresco Heliport, a former heliport in the Scilly islands (IATA code: TSO)

Other uses

Threefold social order, a sociological theory involving the relationship of economy, polity and culture The Sims Online, a massively multiplayer game The Stationery Office, a British publisher Total shares outstanding, the stock held by investors, including restricted shares, as well as those held by the public; see Shares outstanding

See also Tso (disambiguation)