| Fernand Demets | |
| Birth Name: | Fernand Charles Gustave Demets |
| Birth Date: | 1884 3, df=yes |
| Birth Place: | Saint-Gilles |
| Death Place: | Brussels |
| Nationality: | Belgian |
| Occupation: | politician |
Fernand Charles Gustave Demets (pronounced as /fr/; 8 March 1884 – 29 September 1952) was a Belgian liberal politician, burgomaster, and defense minister. Demets was an industrialist and became a municipal council member (1911–1929) and burgomaster (1919–1927) in Anderlecht, then a Liberal senator (1929–1945) in the district of Brussels. Demets was co-president of the Liberal Party (1940–1945). He was minister of defense in 1944-1945 and afterwards became governor of the province of Brabant (1945–1951).