Geitlandsjökull (Icelandic pronunciation: [ˈceitˌlan(t)sˌjœːkʏtl̥] ⓘ) is a lateral glacier of Langjökull, with a flowshed of 13 km2 (5.0 sq mi) from the second largest ice cap in Iceland at 904 km2 (349 sq mi), in the west of Iceland.

[1]: 503  It has also been used as the name for the substantial Langjökull ice cap, as has the name Suðurjöklar.

[2]: 18  The highest point of Geitlandsjökull, which lies on top of a tuya, reaches a height of 1,400 m (4,600 ft).

[3][4] Unlike most of the outlet glaciers of Langjökull which are retreating, its recent mass balance is stable, as it intercepts the predominant low pressure weather systems from the south-west.

[1]: 503 In the Grettis saga the outlaw Grettir Ásmundarson climbed Geitlandsjökull and walked south from it to a grassy valley with hot springs and surrounded by glaciers on all sides.