Real ship and boat classes
* (20th century) of the U.S. Navy * (18th century; 74-gun third rate) of the British Royal Navy * (18th century) of the Royal French Navy; see List of ships of the line of France * (Military Afloat Reach and Sustainability; 20th century) of the Royal Fleet Auxiliary of the British Royal NavyFictional ship and boat classes
* Mars-class starship, of the Federation Starfleet in Star Trek; see Star Trek: Discovery (season 3)See also
* Human mission to Mars, for proposed Mars-capable (Mars "class", "Mars" ship) spaceship designs *