Gabriel Omer Descemet (December 1, 1879[1]—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.
[2] Born into a Metis family in Saint-Louis, Senegal,[3] Descemet attended lycee in Paris and trained in what is now Mali.
[4] 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.