| Type: | town |
| Yannathan | |
| State: | vic |
| Coordinates: | -38.2333°N 183°W |
| Pushpin Label Position: | right |
| Lga: | Shire of Cardinia |
| Postcode: | 3981 |
| Pop: | 272 |
| Stategov: | Bass |
| Fedgov: | Monash |
| Dist1: | 75 |
| Location1: | Melbourne |
| Local Map: | yes |
| Zoom: | 11 |
Yannathan is a bounded rural locality in Victoria, Australia, south-east of Melbourne's central business district, located within the Shire of Cardinia local government area. Yannathan recorded a population of 272 at the 2021 census.
Yannathan Post Office opened on 15 September 1884 and closed in 1959.