• Country code for or the Italian language
• Instituto Tecnológico de Aeronáutica (Aeronautics Technological Institute), an elite engineering school in São José dos Campos, Brazil
• Illinois Trade Association, a trade clearinghouse based in Lincolnwood, Illinois
• Independent Television Authority, the regulator for commercial television in the United Kingdom from 1954 until 1972
• International Telegraph Alphabet, also known as Baudot code
• Independent Testing Authority, a certified voting system test laboratory
• Initial Teaching Alphabet, a script intended for teaching children to read
• Internal thoracic artery, a blood vessel in the thorax
• International Taekwondo Alliance
• International Technology Alliance
• International Tunneling and Underground Space Association
• ITA Software, Inc., a travel industry software firm
• International Trade Administration, an agency of the United States Department of Commerce
• Intercollegiate Tennis Association
• Involuntary Treatment Act, refers to Washington State Involuntary Treatment Act or to a patient under such act

See also Ita.