| HD 12661 b | |
| Discoverer: | Fischer et al. |
| Discovery Site: | California & Carnegie Planet Search  United States |
| Discovered: | April 4, 2001 |
| Apsis: | astron |
| Semimajor: | 0.834± |
| Eccentricity: | 0.361 ± 0.011 |
| Period: | 262.53 ± 0.27 d |
| Time Periastron: | 2,450,214.1 ± 2.9 |
| Arg Peri: | 296.3±2.6 |
| Semi-Amplitude: | 74.19 ± 0.85 |
| Mass: | >2.34 ± 0.19 |
HD 12661 b is a giant exoplanet two and a half times the mass of Jupiter orbiting around the star HD 12661.