Mark III

Mark III or Mark 3 often refers to the third version of a product, frequently military hardware. "Mark", meaning "model" or "variant", can be abbreviated "Mk."

Mark III or Mark 3 can specifically refer to:

In technology

In military and weaponry

• Mark III, a variant of the British Mark I tank
• Supermarine Spitfire Mk III; a single 1940 British fighter aircraft pre-production prototype
• Mk III Turtle helmet (1944); British Army helmet that first saw action in the Normandy Landings
• Merkava Mark III (1989); battle tank of Israel Defense Forces
• Ruger MK III (2004), an American handgun

Other vehicles

• Geosynchronous Satellite Launch Vehicle Mk III
• Aston Martin DB Mark III (1957-1959), a British luxury sports car
• AC Cobra MkIII (aka Shelby Cobra), an American-engined British sports car produced intermittently since 1962
  • Superformance MkIII, a mass-produced replica of the AC Cobra MkIII
• Lincoln Continental Mark III (1969-1971), an American personal luxury car
• British Rail Mark 3 (1976); a rail carriage design for high-speed and regular service
• Kolb Mark III ultralight aircraft

Other technologies

• Harvard Mark III, an early computer built at Harvard University and used by the US Navy
• Mark III (radio telescope), a radio telescope in England, constructed in 1966
• Mesa Boogie Mark III: an electric guitar amplifier designed in Northern California
• Mark III (space suit), a NASA space suit prototype
• Sega Mark III, the original Japanese branding of Sega Master System, a video game console
• Vox Mark III, a teardrop-shaped electric guitar of the 1960s
• Camera models
  • Canon EOS-1D Mark III
  • Canon EOS-1Ds Mark III
• Mark III containment design, a third generation General Electric BWR-6 boiling water nuclear reactor design

In arts and entertainment

• Mk III: The Final Concerts, a 1975 concert album by Deep Purple
• MK III (album), a 2013 album by rock band Steam Powered Giraffe
• Emergency Medical Hologram Mark III, a character on the television series Star Trek: Voyager
• Mark III, a fictional cybernetic tank in the game Ogre
• Mark III Flying Car, a fictional vehicle driven by Danger Mouse
• Cobra Mk III, a spaceship in the computer game Elite

In religion

• Mark 3 or Mark III, the third chapter of the Gospel of Mark in the New Testament of the Christian Bible
• Pope Mark III of Alexandria, patriarch of the Coptic Church from 1116 to 1189