Peisey-Nancroix (French pronunciation: [pɛzɛ nɑ̃kʁwa]; Arpitan: Péjèy) is a commune in the Savoie department in the Auvergne-Rhône-Alpes region in southeastern France.

Peisey-Nancroix has a humid continental climate (Köppen climate classification Dfb) closely bordering on an oceanic climate (Cfb). The average annual temperature in Peisey-Nancroix is 8.2 °C (46.8 °F). The average annual rainfall is 946.9 mm (37.28 in) with December as the wettest month. The temperatures are highest on average in July, at around 17.2 °C (63.0 °F), and lowest in January, at around −0.2 °C (31.6 °F). The highest temperature ever recorded in Peisey-Nancroix was 35.3 °C (95.5 °F) on 27 June 2019; the coldest temperature ever recorded was −23.0 °C (−9.4 °F) on 11 February 1956.