ETO

ETO may refer to:

Science and technology

 * Emitter turn off thyristor, a semiconductor device
 * Ethylene oxide, an organic compound
 * RUNX1T1, a gene
 * Efforts to Outcomes, software produced by Social Solutions

Sports

 * ETO-SZESE Győr FKC, a Hungarian handball club
 * Győri Audi ETO KC, a Hungarian women's handball club
 * ETO Park, a multi-use stadium in Győr, Hungary
 * Stadion ETO, the predecessor of ETO Park

Other

 * Electro-technical officer, on a merchant ship
 * Engineer to order, in supply chain management
 * English Touring Opera, an opera company in the United Kingdom
 * Eton language, a Bantu language
 * European Theater of Operations, United States Army, an American theater of operations in World War II
 * Earth-Trisolaris Organization, an organization in the novel The Three-Body Problem