Collias is a commune in the Gard department in southern France.

Located on the left bank of the Gardon, the town was founded by the Greeks. Successive occupants have left signs : caves occupied in the Paleolithic period, Roman ruins and later pagan and Paleo-Christian remains in the listed site called the Hermitage. The virtually untouched landscapes of the Gardon gorges and the immense plateaux on either side are a paradise for walkers and for all types of river based activities. Collias was a major silk production centre until the 19th century. It is also home to the Picholine olive.

Things to see:-

• The listed site of the Hermitage,
• Nôtre Dame de Laval chapel (outside),
• St. Vincent a 19th century church with paintings (outside),
• Numerous rock climbing passages,
• The Via Ferrata,
• The garrigue and its flora,