Lon or LON may refer to:
- Launch on Need, a Space Shuttle rescue mission which would have been mounted to rescue the crew of a Space Shuttle if needed
- League of Nations, the first permanent international organization for maintaining world peace, predecessor of the United Nations
- Legends of Norrath, an online trading-card game by Sony Online Entertainment
- Local oxidation nanolithography, a nanofabrication technique
- LonTalk, protocol for electronic automation networks
- LonWorks, a control network protocol
- LON, the IATA airport code covering all airports within the London area of the United Kingdom, see London Airport (disambiguation)
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