| Bosporos Planum | |
| Location: | Thaumasia quadrangle (majority) |
| Coordinates: | -33.87°N 64.49°W |
| Length: | 730 |
| Discoverer: | Mariner 9 |
| Type: | Plateau |
| Eponym: | Bosphorus Strait |
Bosporos Planum is a high plateau (planum) located in the Thaumasia quadrangle in the Southern Hemisphere of Mars. It is about 730 km long stretching from southwest to northeast. Previously named Erythraeum Planum,[1] it was renamed to its current name in 1979. Its name derives from one of the classical albedo features observed by early astronomers, named after the Bosphorus Strait.