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