Landmannalaugar (Icelandic pronunciation: [ˈlantˌmanːaˌlœiːɣar̥] (listen)) is a location in Iceland's Fjallabak [ˈfjatlaˌpaːk] Nature Reserve in the Highlands. It is at the edge of the Laugahraun [ˈlœiːɣaˌr̥œiːn] lava field, formed in an eruption in approximately 1477. It is known for its natural geothermal hot springs and surrounding landscape.

Landmannalaugar is at the northern end of the Laugavegur hiking trail, and the Iceland Touring Association operates a mountain hut accommodating hikers. During the high tourist season, a small shop and a horse tour agency operate there, as well as the ICE-SAR highland patrol in Fjallabak. Several bus companies have regular trips to and from Landmannalaugar during the tourist season.