Lon or LON may refer to:

People Lon (name), a list of people with the given name, nickname or surname Lon (photographer), pseudonym of Alonzo Hanagan, also known as "Lon of New York"

Fictional characters Lon Cohen, in the Nero Wolfe novels by Rex Stout Lon Suder, on the television series Star Trek: Voyager

Science and technology Launch on Need, a Space Shuttle rescue mission which would have been mounted to rescue the crew of a Space Shuttle if needed Local Operating Network, a networking platform by Echelon Corporation Local oxidation nanolithography, a nanofabrication technique Lon (butterfly), a genus of butterflies Lon protease family, in molecular biology Longitude (lon.), a geographic coordinate

Other uses League of Nations, the predecessor of the United Nations LON, IATA airport code for airports of London lon, ISO 639-3 code for the Malawi Lomwe language, spoken in southeastern Malawi

See also Lons, a French commune 37608 Löns, an asteroid