| Frédéric Blanchy | |
| Fullname: | Gaston Frédéric Blanchy |
| Birth Date: | 1 July 1868 |
| Birth Place: | Bordeaux, Second French Empire |
| Death Place: | Bordeaux, France |
| Classes: | 2 to 3 ton Open class |
| Club: | Cercle de la Voile d'Arcachon |
| Show-Medals: | yes |
Gaston Frédéric Blanchy (1 July 1868 – 1 October 1944) was a French sailor who competed in the 1900 Summer Olympics. He was crew on the British/French boat Ollé, which won the gold medals in both races of the 2-3 ton class with fellow crew member Jacques Le Lavasseur and helmsman William Exshaw. He also participated in the open class, but did not finish.[1]