TOS may refer to:

General

• Terms of Service
• TOSLINK a standardized optical fibre connection system.

Aviation

• Tromsø Airport, an airport in the northern city of Tromsø, Norway.

Computing

• Tape Operating System, predecessor to IBM's Disk Operating System.
• Tcl Object System, an object-oriented system build on Tcl, which is no longer supported.
• Terms of service, for computer and telecommunications networks.
• The operating system, of the Atari ST range of computers.
• TinyOS, an open-source operating system designed for wireless embedded sensor networks.
• Type of Service, a field found in the header of IPv4 packets.
• In internet slang, "to TOS" someone is to report them for a violation of a service's Terms of Service.

Computer / Video games

• Tales of Symphonia, an RPG for the Gamecube published by Namco.
• TOS TrekMUSE
• Test of Skulls, the name of a part of the Onyxia Key Quest line in the World of Warcraft

Culture

• The Original Series as opposed to The Next Generation, Deep Space Nine, Voyager, or Enterprise.
• The Ordinary Summer, an emo rock band based out of Duxbury Massachusetts ^*

Medicine

• Thoracic outlet syndrome

Organizations

• The Oceanography Society
• Theosophical Order of Service
• Temple of Set

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TOS | TOS