HTL may refer to:Language technology HTL Buses, a bus company based in Merseyside, England Bell HTL a light helicopter Halifax Tool Library, a tool-lending library in Nova Scotia, Canada Heritage Trust of Lincolnshire, in England High tension line, used for electric power transmission Histology technologist High Threshold Logic, an electronic logic technology Höhere Technische Lehranstalt, engineering-focused secondary schools in Austria Hydrothermal liquefaction, a thermochemical depolymerisation process Roscommon County – Blodgett Memorial Airport, in Michigan, United States