Quintenic (; ; 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 . The average annual rainfall is with November as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . The highest temperature ever recorded in Quintenic was on 5 August 2003; the coldest temperature ever recorded was on 19 February 1985.