Cyriaque Cyprien Victor Gillain | |
|---|---|
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| Born | 11 August 1857 Biesme, Belgium |
| Died | 17 August 1931 (aged 74) Uccle, Belgium |
| Allegiance |  Belgium |
| Service | Belgian Army |
| Years of service | 1875–1920 |
| Rank | Lieutenant General |
| Commands | 4th Lancers 1st Cavalry Brigade |
| Battles / wars | World War I |
| Awards | Royal Order of the Lion Distinguished Service Medal (US) |
Cyriaque Cyprien Victor Gillain (11 August 1857 – 17 August 1931) was a Belgian officer who served in World War I and was chief of the Belgian general staff between April 1918 and February 1920.