| Cast | |
| Native Name: | Kast |
| Commune Status: | Commune |
| Coordinates: | 48.1581°N -4.1383°W |
| Insee: | 29025 |
| Postal Code: | 29150 |
| Arrondissement: | Châteaulin |
| Canton: | Crozon |
| Mayor: | Jacques Gouérou[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pleyben-Châteaulin-Porzay |
| Elevation Min M: | 44 |
| Elevation Max M: | 252 |
| Area Km2: | 37.66 |
Cast (in French pronounced as /kast/;) is a commune in the Finistère department of Brittany in north-western France.
Inhabitants of Cast are called in French Castois.