Mars Pathfinder is an American robotic spacecraft that landed a base station with a roving probe on Mars in 1997.

It consisted of a lander, renamed the Carl Sagan Memorial Station, and a lightweight wheeled robotic Mars rover named Sojourner, which became the first rover to operate outside the Earth–Moon system

The mission carried a series of scientific instruments to analyze the Martian atmosphere, climate, and geology and the composition of its rocks and soil.

Originally, the mission was conceived as the first of the Mars Environmental Survey (MESUR) program.