TOS may refer to:

General

* Terms of service * The original series of a particular media, in contrast to a

spin-off Spin-off may refer to: *Spin-off (media), a media work derived from an existing work *Corporate spin-off, a type of corporate action that forms a new company or entity * Government spin-off, civilian goods which are the result of military or gove ...

Chemistry

* Tosyl, a chemical group * Gy's sampling theory (abbreviation)

Entertainment

* '' Star Trek: The Original Series'', a science fiction TV series originally known as ''Star Trek'' * ''

Tree of Savior ''Tree of Savior'' (''also known as TOS'') is a free massively multiplayer online role playing game developed by IMC Games. The game was developed by Kim Hakkyu, creator of ''Ragnarok Online'' while the game's background music was done by variou ...

'', a multiplayer online role playing game published by IMC Games in 2016

Medicine

* Thoracic outlet syndrome, a medical condition * Toxic oil syndrome, caused by consuming non-food grade oil

Organizations

* The Oceanography Society * Theosophical Order of Service, an international organization * Temple of Set, an occult society * Tennessee Ornithological Society * Trucial Oman Scouts, UK force raised in Oman in 1951

Other uses

* TOS-1, a Soviet thermobaric weapon * Tam o' Shanter (cap) *

Atari TOS TOS (The Operating System) is the operating system of the Atari ST range of computers. This range includes the 520ST and 1040ST, their STF/M/FM and STE variants and the Mega ST/STE. Later, 32-bit machines ( TT, Falcon030) were developed using a ...

(Tramiel Operating System), computer operating system *

TOS/360 Disk Operating System/360, also DOS/360, or simply DOS, is the discontinued first member of a sequence of operating systems for IBM System/360, System/370 and later mainframes. It was announced by IBM on the last day of 1964, and it was first ...

, Tape Operating System/360 * Tromsø Airport, Norway, IATA code * Type of service, a field in the header of IPv4 packets * Terminal Operating System, controlling cargo movement * Testament of Solomon, a pseudepigraphical composite text ascribed to King Solomon *

Thinkorswim Thinkorswim by TD Ameritrade (often stylized and officially branded as thinkorswim, lacking capitalization) is an electronic trading platform by TD Ameritrade used to trade financial assets. It is geared for self-directed stock, options and ...