If you mean "Who"...then no-one. But, I think there's a manned mission to Mars planned in the next few years.
Mars has constantly been visited by spacecrafts. The first spacecraft to visit Mars was the Mariner 4. After that Mars has been visited by numerous spacecrafts like: Mars Pathfinder, Mars Global Surveyor, Mars Odyssey, Mars Express and the Mars 2 which was the first spacecraft to land on Mars.
No person has ever visited Mars yet.
The First Aircraft that ever visited the planet is the dumbest question, Don't you know how to specify questions fool?
It's the closet and rather similar to the earth.
Dear Wiki Questioner, The first spacecraft that visited the planet Mars was the "Mariner 4". It was launched by NASA in 1964 and simply flew past Mars, taking pictures and gathering information as it passed! The first spacecraft to LAND ON Mars were the "Mars 2" and "Mars 3" probes launched by the USSR in 1971. Unfortunately, both of these probes stopped functioning not long after landing on Mars. NASA's "Viking 1" lander was the first spacecraft to land on Mars and function for an extended period of time (6 years in fact). You can Read more on this subject by visiting the following web page: http://en.wikipedia.org/wiki/Mars#Past_missions
venus was the first planet visited by the American spacecraft
Mars is the planet that is least unlikely to be visited by humans
No, Mars is not the most visited planet in our solar system. The most visited planet is Earth, followed by Mars and Venus. Multiple spacecraft have been sent to Mars to study its surface and atmosphere, but Earth remains the most visited due to human presence and satellite communications.
There are no people on Mars, and no astronauts have visited Mars. The Moon, yes, Mars, no.
No human has ever visited Mars. None have ever been further than Earth's moon.
No human has visited Mars yet. However, there are plans by space agencies like NASA to send astronauts to Mars in the future using advanced spacecraft and technology.
None. No human has ever visited Mars.