Pornic (French pronunciation: [pɔʁnik] ⓘ; Pornizh in Breton, Port-Nitz in Gallo) is a commune in the Loire-Atlantique department in western France.

In 1973 the commune of Pornic absorbed the neighbouring municipalities of Sainte-Marie-sur-Mer and Clion-sur-Mer.

The municipality launched a linguistic plan through Ya d'ar brezhoneg on 1 March 2006.

Pornic has a Csb type climate (Mediterranean with mild summers).

Pornic's average temperature between 1971 and 2000 is approximately 12.8 °C.