Thórsmörk (, ) is a mountain ridge in Iceland that was named after the Norse god Thor (Þórr). It is situated in the south of Iceland between the glaciers Tindfjallajökull and Eyjafjallajökull. The name "Thórsmörk" properly refers only to the mountain ridge between the rivers Krossá, Þröngá and Markarfljót, but is sometimes used informally to describe a wider area that includes the region between Thórsmörk and Eyjafjallajökull. Thórsmörk is one of the most popular hiking areas in Iceland.