We might go there some day so yes. Life may have been present on Mars at one time and has a slight chance of still being there.
The best chances for life within our solar system outside of Earth however are Sol's icy moons and dwarf planets. Hydrothermal vents heated by the core of such worlds heat massive oceans underneath miles of ice. It is possible life has evolved under some of those worlds' exteriors.
Or perhaps some odd form of life very different then life on Earth has evolved on the moon Titan. Instead of using water like all life on Earth life on Titan might take advantage of the oceans of hydrocarbons on Titan's surface. Imagine life with veins pumping liquid methane for blood.