Colognac (; ) is a commune in the Gard department in southern France.
Colognac has a warm-summer Mediterranean climate (Köppen climate classification Csb). The average annual temperature in Colognac 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 Colognac was on 21 August 2012; the coldest temperature ever recorded was on 27 February 2018.