| Eta2 Hydri b | |
| Discoverer: | Setiawan et al. |
| Discovery Site: | Chile, La Silla |
| Discovered: | 25 May 2005 |
| Apsis: | astron |
| Semimajor: | 1.93AU |
| Eccentricity: | 0.40±0.07 |
| Period: | 711±8 d |
| Time Periastron: | 2,451,420 |
| Arg Peri: | 351.5±9.5 |
| Semi-Amplitude: | 105±8 |
| Star: | Eta2 Hydri |
| Mass: | >6.54 |
Eta2 Hydri b (η2 Hyi b, η2 Hydri b), commonly known as HD 11977 b, is an extrasolar planet that is approximately 217 light-years away in the constellation of Hydrus. The presence of the planet around an intermediately massive giant star provides indirect evidence for the existence of planetary systems around A-type stars.