The three letter acronym WTO has several meanings.

• Most commonly, it refers to the World Trade Organization.
• Formerly, the World Tourism Organization, which is now officially abbreviated as UNWTO
• Also formely used as abbreviation of Warsaw Treaty Organization, usually known as Warsaw Pact, in opposition to the North Atlantic Treaty Organisation (NATO).
• the World Toilet Organization
• write-to-operator, a macro used in computer programming
• a song by the California punk group Pennywise, which appeared on their sixth album Land of the Free?.

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