| Boissy-sans-Avoir | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Boissy-sans-Avoir (Yvelines).svg |
| Arrondissement: | Rambouillet |
| Canton: | Aubergenville |
| Insee: | 78084 |
| Postal Code: | 78490 |
| Mayor: | Grégoire Corby[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.8211°N 1.7944°W |
| Elevation M: | 95 |
| Elevation Min M: | 77 |
| Elevation Max M: | 116 |
| Area Km2: | 3.96 |
Boissy-sans-Avoir (in French pronounced as /bwasi sɑ̃z‿avwaʁ/) is a commune in the Yvelines department in north-central France.
It is the burial place of actress Romy Schneider (1938–1982) and her son David (1966–1981).