| Bay-sur-Aube | |
| Commune Status: | Commune |
| Arrondissement: | Langres |
| Canton: | Villegusien-le-Lac |
| Insee: | 52040 |
| Postal Code: | 52160 |
| Mayor: | Yves Vaillant[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 47.8219°N 5.0642°W |
| Elevation M: | 320 |
| Elevation Min M: | 307 |
| Elevation Max M: | 446 |
| Area Km2: | 9.75 |
Bay-sur-Aube (in French pronounced as /bɛ syʁ ob/, literally Bay on Aube) is a commune in the Haute-Marne department in the Grand Est region in northeastern France.