| Cosette Saint-Omer-Roy | |
| Birth Date: | 1902 3, df=yes |
| Birth Place: | Alès, France |
| Death Place: | Cannes, France |
| Frenchopenresult: | 2R (1938) |
| Frenchopendoublesresult: | SF (1939) |
| Wimbledondoublesresult: | 3R (1939) |
| Frenchopenmixedresult: | 2R (1938, 1939) |
Cosette Saint-Omer-Roy (last name also spelled St. Omer-Roy, born 6 March 1902, deceased 14 September 1985[1]) was a French tennis player. With Alice Weiwers as her partner, she won the doubles' event at the Tournoi de France, a stand-in tournament in place of the French Championships three times during World War II.[2] With Weiwers, she also reached the semifinals before the war at the 1939 French Championships, where they lost to the eventual champions Jadwiga Jędrzejowska and Simonne Mathieu. They also won a match together at Wimbledon in 1939. In singles, Saint-Omer-Roy entered the French Championships twice in 1938 and 1939, but did not win a match either time. Saint-Omer-Roy also served as manager of the Cannes Tennis Club from 1932.[3]