SAN MARCO 4
| Launched | 17 February 1974 |
| Flight ended | 3 May 1976 |
| Status | Decayed |
| Launch site | San Marco Launch Platform, Indian Ocean (Kenya) |
| Owner | Italy |
| NORAD ID | 7154 |
| COSPAR ID | 1974-009A |
| Alternative names |
C-2 |
| Observing |
Launched alongside
SCOUT D-1 R/B