Haute-Savoie (; Arpitan : 'Savouè d’Amont' / 'Hiôta-Savouè'; ; ) is a department in the Rhône-Alpes region of eastern France, bordering both Switzerland and Italy. Its capital is Annecy. To the north is Lake Geneva and Switzerland; to the south and southeast are the Mont Blanc and Aravis mountain ranges. The French entrance to the Mont Blanc Tunnel to Italy is in Haute-Savoie. It is noted for winter sports; the first Winter Olympic Games were held at Chamonix in 1924.
Before 1860, the territory occupied by modern Haute-Savoie and the adjoining department of Savoie was part of the Kingdom of Sardinia since the Treaty of Utrecht in 1713. Annexation of the region by France was formalized in the Treaty of Turin on .
From November 1942 to September 1943, Haute-Savoie was subjected to military occupation by Fascist Italy. The Maquis des Glières (a band of Free French Resistance fighters who opposed the Nazi, Vichy and Milice regimes during World War II) operated from Haute-Savoie.