COSMOS 1901
| Launched | 13 December 1987 | 
| Flight ended | 2 February 1988 | 
| Status | Decayed | 
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) | 
| Owner | Commonwealth of Independent States (former USSR) | 
| NORAD ID | 18666 | 
| COSPAR ID | 1987-102A | 
| Observing | 
Launched alongside
SL-4 R/B