The Icelandic Coast Guard (Icelandic: Landhelgisgæsla Íslands, Landhelgisgæslan or simply Gæslan) is the service responsible for Iceland's coastal defense and maritime and aeronautical search and rescue. Its origins can be traced to 1859, when the corvette Ørnen started patrolling Icelandic waters. In 1906, Iceland's first purposely built guard-ship, Islands Falk, began operation. Iceland's own defense of its territorial waters began around 1920 and the Icelandic Coast Guard was formally founded on 1 July 1926. The first cannon was put on the trawler Thor in 1924 and on 23 June 1926 the first ship built for the Coast Guard, named Óðinn, arrived in Iceland. Three years later, on 14 July 1929 the coastal defence ship Ægir was added to the Coast Guard fleet.
The Icelandic Coast Guard played its largest role during the Cod Wars between 1972 and 1975, when the Coast Guard ships would cut the trawl wires of British and West German trawlers and engaged in confrontations with Royal Navy warships, in order to enforce a disputed expansion on Icelandic fishing territory.
The Coast Guard also maintains the Iceland Air Defence System which conducts ground surveillance of Iceland's air space.