Echo is:

• Echo - character in Greek mythology
• echo - natural phenomenon
• Echo sounding
• Forward echo
• Echo, Minnesota
• Echo Township, Minnesota
• Echo Township, Michigan
• Echo Lake, Washington
• The rock band Echo & the Bunnymen
• The 1999 album Echo by Tom Petty
• the letter E in the NATO phonetic alphabet.
• the name of several albums — see Echo (album)
• echo, a classic Unix command to display a line of text, usually part of shells
• Echo I and Echo II also designate two classes of Soviet submarines
• /echo is one of the basic commands in mIRC's scripting language.
• European Community Humanitarian aid Office (ECHO) - the humanitarian aid department of the EU
• Echo satellite was one of the first communication satellites