Agnes of Faucigny (died 11 August 1268) was suo jure ruling Dame of Faucigny from 1253, as well as countess consort of Savoy by marriage to Peter II, Count of Savoy.

She was born the eldest daughter of Aymon II, Seigneur de Faucigny, and Beatrix d'Auxonne.

Betrothed in February 1234, Agnes was married to Peter II, Count of Savoy sometime after 25 June 1236.

She had a daughter, Beatrice or Beatrix (c. 1237 – 21 November 1310), who married firstly Guigues VII of Viennois and secondly Gaston VII of Béarn; but due to the Salic law of succession, Beatrice was excluded from the succession to the County of Savoy, which would pass to Philip I, Count of Savoy after her husband's death.

This would lead to future territorial dispute between the House of Savoy and the Dauphin de Viennois over the territory, which the House of Savoy won back from the French at the Treaty of Paris (1355).