Silfiac (French pronunciation: [silfjak]; Breton: Silieg) is a commune in the Morbihan department of Brittany in north-western France.

The village centre of Silfiac is the highest in the department of Morbihan. It is 270 meters above sea level. Silfiac is border by Séglien to the south, by Cléguérec and Sainte-Brigitte to the east, by Lescouët-Gouarec and Perret to the north and by Langoëlan to the west.

Inhabitants of Silfiac are called in French Silfiacois.

Historical population

Year Pop. ±% p.a. 1793 672 —     1800 732 +1.23% 1806 913 +3.75% 1821 746 −1.34% 1831 1,004 +3.01% 1836 1,022 +0.36% 1841 977 −0.90% 1846 1,183 +3.90% 1851 1,150 −0.56% 1856 1,002 −2.72% 1861 959 −0.87% 1866 1,008 +1.00% 1872 886 −2.13% 1876 946 +1.65% 1881 934 −0.25% 1886 952 +0.38% 1891 1,014 +1.27% 1896 1,017 +0.06%	Year Pop. ±% p.a. 1901 1,082 +1.25% 1906 1,152 +1.26% 1911 1,180 +0.48% 1921 1,209 +0.24% 1926 1,157 −0.88% 1931 1,019 −2.51% 1936 994 −0.50% 1946 956 −0.39% 1954 897 −0.79% 1962 781 −1.72% 1968 683 −2.21% 1975 588 −2.12% 1982 526 −1.58% 1990 459 −1.69% 1999 445 −0.34% 2009 456 +0.24% 2014 442 −0.62% 2020 478 +1.31%
Source: EHESS and INSEE (1968–2020)

A six meters high standing stone called Quenouille du Diable (devil's distaff) rises in the town. It is one of the most imposing menhirs in Brittany.

The Rohans and the Fravals were the main lords of the parish. Their coats of arms are visible on the south wall of the Saint-Laurent chapel. The Fraval owned the manor of Crenihuel, in Silfiac.

• Communes of the Morbihan department
• Gaston-Auguste Schweitzer Sculptor Silfiac war memorial

• Base Mérimée: Search for heritage in the commune, Ministère français de la Culture. (in French)
• Mayors of Morbihan Association (in French)