Cerniat (French: [sɛʁnja]; Arpitan: Cèrniê [ˈθɛrɲa] ) is a former municipality in the district of Gruyère in the Canton of Fribourg in Switzerland . On 1 January 2014 the former municipalities of Cerniat and Charmey merged into the new municipality of Val-de-Charmey .

Cerniat is first mentioned in 1288 as Sernia.

Before the merger, Cerniat had a total area of 33.7 km2 (13.0 sq mi). Of this area, 13.78 km2 (5.32 sq mi) or 40.9% is used for agricultural purposes, while 18.47 km2 (7.13 sq mi) or 54.8% is forested. Of the rest of the land, 0.79 km2 (0.31 sq mi) or 2.3% is settled (buildings or roads), 0.26 km2 (0.10 sq mi) or 0.8% is either rivers or lakes and 0.43 km2 (0.17 sq mi) or 1.3% is unproductive land.