ETO may refer to:

  • Earth to orbit, the process or means of placing a payload into an orbit around the Earth
  • Engineer to order, a production approach where once a confirmed order for products is received, products are built
  • Ethylene oxide, an important industrial chemical
    • ETO sterilizer (or ET sterilizer), a type of sterilizer for medical equipment
  • European Theater of Operations, the term used in the United States to refer to US operations north of the Mediterranean coast, in the European Theatre of World War II
  • Samuel Eto'o (born 1981), Cameroonian football player
  • ETO, another name for RUNX1T1
  • Eto Demerzel, a recurring character in Isaac Asimov's books
  • Győri ETO KC, is a Hungarian women's handball club from Győr
  • ETO Park, a multi-use stadium in Győr, Hungary
  • Early termination option, a clause in sports contracts that allows players to forgo their option year
  • Grant ETO, a phrase used by NGO, Non-Profit and community service organizations to measure productivity and penetration. Similar in many respects to traditional business use of P&L (Profit and Loss) and Productivity Evaluation and Tracking products and software. Some of the key companys in this area are,, and all of whom provide both FREE and paid solutions.