MARS 6
| Launched | 4 August 1973 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 6768 |
| COSPAR ID | 1973-052A |
| Observing |
Timeline
| 1973 Aug 5 | – | Launch from Baikonur 81/23 |
| 1974 Mar 12 | – | Separation of lander from spacecraft bus |
| 1974 Mar 12 | – | Flyby of Mars by spacecraft bus |
| 1974 Mar 12 | – | Crash landing of decent module on surface of Mars |
| 1974 Mar 12 | – | Mission ended |