Echo may refer to:

• Science and technology
  • Echo (phenomenon), a natural acoustic phenomenon named after the nymph.
  • Echovirus, short for "enteric cytopathic human orphan" virus
  • Echo I or Echo II, classes of Soviet submarines
  • Echo satellite, one of the first communications satellites.
  • Echo sounding, a way to measure water depth.
  • Forward echo, a type of reflection on a transmission line.
  • Reverse echo, a variation on forward echo.
  • Echo cancellation, techniques for reductions in the perception of electrical and acoustic echo.
  • Radiofrequency signals from spins generated after a time delay by some mechanisms in NMR & MRI, e.g. spin echoes and gradient echoes.

• Computers
  • Echo (computing), a Unix command to display a line of text.
  • ECHO protocol, an internet protocol.
  • Echo (framework), a web framework for Java programming.
  • Echo (fidonet), a discussion forum on FidoNet, similar to a Usenet Newsgroup.
  • /echo, a command in mIRC's scripting language
  • Echo (Echonyc.com) online comunity, "the East Coast answer to the WELL"

• Fiction and mythology
  • Echo (mythology), a nymph from Greek mythology.
  • Echo (comics), a character in the Marvel universe.
  • The Echoes, aliens from the UK TV series Invasion Earth.

• Music
  • Echo (band), a jazz/electro band from New York City
  • Echo (song), a song by the nu metal group Trapt.
  • Echo (album), any of several albums by this name.
  • Echo (record label), a recording label
  • ECHO, a German music award.
  • Echo & the Bunnymen, a rock band.
  • The Echo (venue), a venue in Los Angeles, California

• Miscellaneous
  • ECHO (European Commission), the humanitarian aid department of the EU.
  • A letter in the NATO phonetic alphabet.
  • Toyota Echo, a model of automobile sold in North America.
  • Fox's Echo, a chocolate bar.
  • Echo magazine, The Quarterly Echo Student Magazine.
  • 60_Echo, an asteroid

• English-language newspapers:
  • The Echo (Irish Newspaper) regional newspaper, Dublin Ireland
  • The Northern Rivers Echo
  • The Northern Echo
  • The Irish Echo
  • The Liverpool Echo
  • The Evening Echo
  • The Northampton Chronicle and Echo
  • The Haliburton Echo

• Places
  • Echo, Minnesota
  • Echo, Oregon
  • Echo Township, Minnesota
  • Echo Township, Michigan
  • Echo Lake, Washington

• Wikipedia
  • WikiProject Echo, a project to find information present in foreign language Wikipedias but not in this English Language Wikipedia.

Echo | Echo (Begriffsklärung) | Écho | 에코 (동음이의) | Eco (disambigua) | Echo | Echo (strona ujednoznaczniająca) | Eco (desambiguação) | Эхо | Echo | Eko (olika betydelser)