Olt
Olt or OLT may refer to:
People:
- Károly Olt (1904–1985), Hungarian politician
 - Mike Olt (born 1988), American baseball player
 
Places:
- Olt County, a county (județ) of Romania
 - Olt (river), a river in Romania
- Olt Defile, a defile that has been cut into the Transyvanian Alps in south-central Romania by the river Olt
 
 - Lot (river), a river in France, formerly called the Olt
 - Olton railway station, England (National Rail code: OLT)
 
In science and technology:
- OLT (mobile network), a former manual mobile telephone network in Norway
 - Optical line termination, a piece of telecommunications equipment used for fiber-optic communications
 - Orthotopic liver transplant, in medicine
 - Overwhelmingly Large Telescope, a proposed optical telescope
 
Other uses:
- Orangutan Land Trust, a UK charity working for the long-term survival of the orangutan
 - OLT, 1969 novel by Kenneth Gangemi
 - OLT Express Germany, a German airline