ETI

• Ecobank Transnational Inc., a pan-African banking conglomerate
• Electric Transit, Inc., a defunct American trolleybus manufacturer
• Electronic Temperature Instruments, a British instrumentation manufacturer
• Elemental Technologies, Inc., an American video software company
• Energy Technologies Institute, a British energy research institute
• Ente Tabacchi Italiani, an Italian tobacco company
• Equipment and Tool Institute, an American automotive trade association
• Ethical Trading Initiative, a British membership organisation promoting ethical supply-chain management
• Eti (company), a Turkish food company
• Eti Maden, a Turkish mining and chemicals company

• Eti Livni (born 1948), Israeli politician
• Eti Saaga (1950–2017), American Samoan writer
• Eti Tavares (born 1993), Bissau-Guinean footballer

• Ethyl iodide
• Effector-triggered immunity
• Extraterrestrial intelligence

• Eti (film), a 2008 Indian Bengali-language film
• Eti River, Sarem Island, Indonesia
• Electronics Today International, a defunct magazine
• "E.T.I. (Extra Terrestrial Intelligence)", a song by Blue Öyster Cult from their 1976 album Agents of Fortune

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