ETI may refer to:
Organizations 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
People Eti Livni (born 1948), Israeli politician Eti Saaga (1950–2017), American Samoan writer Eti Tavares (born 1993), Bissau-Guinean footballer
Science Ethyl iodide Effector-triggered immunity Extraterrestrial intelligence
Other uses 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