| From | Senegal |
| Gender | male |
| Birth | 1 December 1879, Saint-Louis, Saint-Louis, Senegal |
| Death |
23 August 1961 (aged 81 years) |
| Star sign | Sagittarius |
Gabriel Omer Descemet (December 1, 1879—1961) was a Senegalese colonial administrator. He served as acting lieutenant governor of Mauritania from 19 June 1931 to 22 June 1933 and lieutenant governor from 7 April 1934 to 5 July 1934. Born into a Metis family in Saint-Louis, Senegal, Descemet attended lycee in Paris and trained in Sudan. He climbed higher in the French administration than many Metis, serving for 25 years in Haut-Senegal-Niger. As governor of Mauritania, he initiated an investigation of the claims of Louis Hunkanrin, including those of murder and slavery.