| Tournebu | |
| Arrondissement: | Caen |
| Canton: | Le Hom |
| Commune: | Cesny-les-Sources |
| Insee: | 14703 |
| Postal Code: | 14220 |
| Coordinates: | 48.9697°N -0.3394°W |
| Elevation M: | 150 |
| Elevation Min M: | 109 |
| Elevation Max M: | 188 |
| Area Km2: | 11.4 |
| Population: | 368 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Tournebu (in French pronounced as /tuʁnəby/) is a former commune in the Calvados department in the Normandy region in northwestern France. On 1 January 2019, it was merged into the new commune of Cesny-les-Sources.[2]