COSMOS 2156
| Launched | 18 September 1991 |
| Flight ended | 16 November 1991 |
| Status | Decayed |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 21713 |
| COSPAR ID | 1991-066A |
| Observing |
Launched alongside
SL-4 R/B