TOS, tos, ToS, or TOs commonly refers to:

Terms of service, the legal agreements between service providers and the service consumers

TOS, tos, ToS, or TOs may also refer to:

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

Entertainment Star Trek: The Original Series, a name retroactively applied to the 1960s science fiction TV series originally known as Star Trek Temple of Shadows, 2004 album by Angra T·O·S (Terminate on Sight), 2008 album by G-Unit Town of Salem, a social deduction game published by BlankMediaGames in 2014 Tree of Savior, 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 Television Oita System, a television station in Oita Prefecture, Japan

Other uses TOS-1, a Soviet thermobaric weapon Atari TOS, or The Operating System, the operating system of the Atari ST range of computers TOS/360, or Tape Operating System/360 Tam o' shanter (cap), a traditional Scottish bonnet Terminal Operating System, controlling cargo movement Testament of Solomon, a pseudepigraphical composite text ascribed to King Solomon Type of service, a field in the header of IPv4 packets Highland Totonac language (ISO 639-3 code: iso) Tromsø Airport, Norway (IATA code: ISO)

See also Toos (disambiguation) Toss (disambiguation)