Quintenic (French pronunciation: [kɛ̃tnik]; Breton: Kistenid; Gallo: Qeintenit) is a commune in Côtes-d'Armor, a department of Brittany in northwestern France.

Quintenic has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Quintenic is 11.3 °C (52.3 °F). The average annual rainfall is 743.4 mm (29.27 in) with November as the wettest month. The temperatures are highest on average in August, at around 17.5 °C (63.5 °F), and lowest in January, at around 5.8 °C (42.4 °F). The highest temperature ever recorded in Quintenic was 39.7 °C (103.5 °F) on 5 August 2003; the coldest temperature ever recorded was −14.7 °C (5.5 °F) on 19 February 1985.