Lierne is a municipality in Nord-Trøndelag county, Norway. It is part of the Namdalen region, and it is the largest municipality in Trøndelag. The administrative centre of the municipality is the village of Sandvika. Other villages include Inderdal, Sørli, and Tunnsjø senter. The municipality borders Sweden to the south and east. Most of Lierne lies on the Swedish side of the drainage divide between Norway and Sweden.

The cross-country race Flyktningerennet is held here every year. It is a race that follows a route from Nordli to Gäddede in Strömsund Municipality, Sweden, in remembrance of the people who fled Nazi German-occupied Norway for Sweden during the Second World War.

The municipality of Lierne was established on 1 January 1874 when it was separated from Snåsa. Initially, the population of Lierne was 1,015. On 1 July 1915, it was divided into two municipalities: Nordli (population: 863) and Sørli (population: 739). This division, however, was short-lived. On 1 January 1964 they were merged back together again under the former name Lierne. After the merger, there were 2,045 residents in the new municipality.

The Old Norse form of the name was Finnahlíð, where the first element is the plural genitive case of finnr which means "Sami person" (because the district was mostly populated by Sami people at the time). The later form Lierne is the definite plural form of li (Old Norse hlíð) which means "mountainside".

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