Thiers (French pronunciation: [tjɛːʁ] ⓘ; Auvergnat: Tièrn) is a commune in the Puy-de-Dôme department of Auvergne in central France.

The city extends over 7 kilometres (4+1⁄4 miles) on a rocky spur overhanging the nearby mountains and the villages.

Thiers is on the steep hills overlooking the Durolle Valley, and the gradient provides hydropower for grinding mills.

In 1999, the mountain overlooking the city was the target of arsonists who set fire to the forest near the Margerides cliff.

Verdun Square, on Rue Grammont, has a monument commemorating French efforts during World War I. Les Jardins de Saint-Jean are between the old Thiers hospital and the Durolle River.

Natural areas surrounding Thiers are the Limagne plain in the west; the Dore valley, largely classified and protected by the Natura 2000 network; the Livradois-Forez Regional Natural Park, and the Auvergne volcanoes beyond the Limagne plain.

Thiers began an urban renewal project in 2002, rehabilitating Antonin Chastel Place, the San Juan district and the Transvaal streets.

The repression of counterrevolutionary activities in Thiers began in June 1791, after Louis XVI's flight to Varennes, intensifying in February 1793 against the clergy and triggering a wave of emigration which lasted until 1815.

Forty-nine people were arrested in Thiers, primarily those involved in the revolts of Vollore-Ville and Servant, in October 1793.

The troops were divided among Thiers, Randan, Saint-Yorre, Le Mayet-de-Montagne, the Francs-Tireurs et Partisans (FTP) of the 103rd FFI battalion (led by Major André Rossignol, known as "Pigeon") and the 104th Battalion of Major Roger Beligat (alias "Alain Derval").

Factories include Forges Gorce, who make blades for agricultural machinery from hedge trimmers to combine harvesters.

Le Creux de l'enfer is a center of contemporary art, with national and international programming.

The 70-hectare (170-acre) centre, Auvergne's largest, is part of the Natura 2000 network and the Livradois-Forez Regional Natural Park.