HLN

HLN may refer to:


 * Harlington railway station (station code), in England
 * HLN (TV network), an American television news network
 * Helena Regional Airport (IATA airport code), in Montana, United States
 * Het Laatste Nieuws ("The Latest News"), a Belgian Dutch-language newspaper
 * Hikami-Larkin-Nagaoka equation, describing weak localization in low-temperature physics
 * Horizon League Network, a collegiate athletic conference in the Midwestern United States
 * Phenolphthalein, a chemical indicator, abbreviated "Hln"