Missillac (French pronunciation: [misijak] ; Gallo: Misilhac, Breton: Merzhelieg) is a commune located in the department of Loire-Atlantique in western France.

Missillac is located at the northwestern edge of Loire-Atlantique at the limit of the Morbihan 25 km from Saint-Nazaire, 65 km northwest of Nantes, and 25 km south of Redon. The communes bordering Missillac are Sévérac, Saint-Gildas-des-Bois, Sainte-Reine-de-Bretagne, La Chapelle-des-Marais, Herbignac, and Pontchâteau.

Historical population

Year Pop. ±% p.a. 1793 2,200 —     1800 2,042 −1.06% 1806 2,066 +0.19% 1821 2,457 +1.16% 1831 2,615 +0.63% 1841 2,687 +0.27% 1846 2,850 +1.18% 1851 2,877 +0.19% 1856 2,977 +0.69% 1861 3,239 +1.70% 1866 3,453 +1.29% 1872 3,565 +0.53% 1876 3,616 +0.36% 1881 3,837 +1.19% 1886 3,877 +0.21% 1891 3,876 −0.01% 1896 3,840 −0.19% 1901 3,985 +0.74%	Year Pop. ±% p.a. 1906 4,053 +0.34% 1911 3,965 −0.44% 1921 3,496 −1.25% 1926 3,416 −0.46% 1931 3,291 −0.74% 1936 3,170 −0.75% 1946 3,212 +0.13% 1954 3,295 +0.32% 1962 3,585 +1.06% 1968 3,652 +0.31% 1975 3,687 +0.14% 1982 3,883 +0.74% 1990 3,915 +0.10% 1999 3,813 −0.29% 2007 4,557 +2.25% 2012 5,016 +1.94% 2017 5,342 +1.27%
Source: EHESS and INSEE (1968-2017)

The commune is crossed by the Nantes-Vannes expressway.

• La Baule - Guérande Peninsula
• Communes of the Loire-Atlantique department
• Parc naturel régional de Brière