| HD 212301 b | |
| Discoverer: | Lo Curto et al. |
| Discovery Site: | La Silla Observatory |
| Discovered: | August 22, 2005 |
| Apsis: | astron |
| Aphelion: | 0.0341AU |
| Perihelion: | 0.0341AU |
| Semimajor: | 0.0341AU |
| Eccentricity: | 0 |
| Period: | 2.24572 ± 28 d 53.897 h |
| Avg Speed: | 166 |
| Time Periastron: | 2453549.195 ± 0.004 |
| Arg Peri: | 0 |
| Semi-Amplitude: | 59.5 ± 0.7 |
HD 212301 b is an extrasolar planet located approximately 172 light-years (53 parsecs) away in the constellation of Octans, orbiting the star HD 212301. It has an orbital period of 2.25 Earth days. The orbital distance is 0.0341 astronomical units or 5.10 gigameters.
On August 22, 2005, taking place in ESO La Silla Observatory in Chile, the planet was discovered by Lo Curto who used the HARPS spectrometer.