ATO

ATO may refer to:

Technology

• Arsenic trioxide a potent chemotherapeutic agent for acute promyelocytyc leukemia

Other

• Abort to Orbit, an intact abort procedure for Space Shuttle launches
• Accumulated Time Off, a method of accumulating paid or unpaid absence hours based on hours worked
• Account takeover, a form of payments and online fraud
• Ad Text Optimization, the process of copywriting Google AdWords ad text for the purpose of improving click through rates
• After timeout, a play in basketball run after an offensive timeout, often with the ball put in play from a sideline
• Air Tasking Order, (United States Air Force)
• Air Traffic Organization, an FAA terminology
• Air Training Officer, a former position at the United States Air Force Academy
• Air Transportation Office (Philippines), agency of the Philippine government
• Alpha Tau Omega, an American student fraternity
• Alpha Tau Omega (Philippines), a Filipino student fraternity
• Alternative Trading Organization, an NGO focusing on Fair Trade exports
• Amiga Translators' Organization, an organization for translating Commodore Amiga applications
• Ammunition Technical Officer, a designation in the British Armed Forces
• Anti-Terrorism Officer, a position in the Homeland Security Community
• Ato Alexander (Stylized as ATO) a British rapper known for his work with EDEN
• Arab Towns Organization, a network to promote cooperation between and development of Arab cities
• Assemble To Order, see build to order
• Assisted take off
• ATO, the Amtrak station code for Atco (NJT station), New Jersey, U.S.A.
• ATO Records, a record label
• Atmos Energy Corporation's ticker symbol on the New York Stock Exchange
• Australian Taxation Office, the Australian government tax agency
• Authority to Operate
• Automatic train operation
• Amateur Try-Out, a type of ice hockey contract
• ATO fuse
• Anti-Terrorist Operation in Ukraine, the Ukrainian government's operation in the War in Donbass, 2014–2018
  • ATO zone, the official name for territory where the War in Donbass takes place

Ato may refer to:

• A cacodemon of the Enochian angels
• Ato, Yamaguchi – a Japanese town
• Ato Station
• Osman Ali Atto also written Osman Ali Ato, a Somali warlord
• One of three 2002 Football World Cup mascots