The Granni (Icelandic pronunciation: [ˈkranːɪ]) is a waterfall that cascades into the Fossardalur right beside the Háifoss.

These two waterfalls did not have a name until the beginning of the 19th century,[1][2] but Nágranni or granni is the Icelandic word for neighbor while Hái means tall.

The river Fossá í Þjórsárdal is divided into two arms some 750 meters upstream from the waterfalls.

Both waterfalls can be seen from a sightseeing platform which is on the south side of the falls.

The volcano Hekla is within sight in the background.