Is entirely by robots.
13 missions, 1971-2012. Estimated mass: 9,303kg.
Entities on Mars
Artificial object | Nationality | Landed | Mass | Last Contact |
| Mars 2 | USSR | 1971 | 1210kg | |
| Mars 3 | USSR | 1971 | 1210kg | |
| Mars 6 | USSR | 1973 | 635kg | |
| Viking 1 | USA | 1976 | 657kg | Nov 11, 1982 |
| Viking 2 | USA | 1976 | 657kg | Apr 11, 1980 |
| Mars Pathfinder & Sojourner | USA | 1997 | 360kg | Sep 27, 1997 |
| Mars Climate Orbiter | USA | 1999 | 629kg | |
| Mars Polar & Deep Space 2 | USA | 1999 | 500kg | |
| Beagle 2 | UK | 2003 | 33.2kg | |
| Spirit rover MER-A | USA | 2004 | 185kg | Mar 22, 2010 |
| Opportunity rover MER-B | USA | 2004 | 185kg | In operation |
| Phoenix Mars | USA | 2008 | 350kg | Nov 2, 2008 |
| Mars Science Lab Curiosity | USA | 2012 | 900kg | In operation |
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