Snæfellsjökull (Icelandic for "snow-fells glacier" or "snow-mountains glacier") is a 700,000 year old stratovolcano with a glacier covering its summit in western Iceland. The name of the mountain is actually Snæfell, but it is normally called "Snæfellsjökull" to distinguish it from two other mountains with this name. It is situated on the most western part of the Snæfellsnes peninsula in Iceland. Sometimes it may be seen from the city of Reykjavík over the bay of Faxaflói, at a distance of 120 km.

The mountain is one of the most famous sites of Iceland, primarily due to the novel A Journey to the Center of the Earth (1864) by Jules Verne, in which the protagonists find the entrance to a passage leading to the center of the earth on Snæfellsjökull.

The mountain is included in the Snæfellsjökull National Park (Icelandic: Þjóðgarðurinn Snæfellsjökull).