ECH is a three-letter abbreviation or acronym which may represent
- The Enhanced Combat Helmet (disambiguation), a name shared by two combat helmets
- the erase character in the ANSI X3.64 character set
- the IATA airport code for Echuca Airport, Echuca, Victoria, Australia
- the Emergency Command Hologram on the Starship Voyager from Star Trek: Voyager
- European Championships
- Embedded contact homology in mathematics
- Epichlorohydrin, a chemical compound
- Enterprise Cultural Heritage, a company asset