The following are known Action Replay Codes for Contra III: The Alien Wars on Super Nintendo Entertainment System (SNES).

• Infinite bombs on side-view levels
  01802EDD
• Infiinite lives on side view level only
  019B91DD
• On the side view levels, a picture of a boss appears. Shoot it for lots of points.
  01BB8175
• Less side view enemies
  01BB8185
• No repeating enemies
  01BB8775
• Infinite Bombs on top view levels
  0291BEDD
• Infinite lives on top view levels
  029695DD
• Infinite lives on top view levels part 2
  02969880
• Infinite lives for side view levels
  189091DD
• Infinite lives for the top view levels part 1
  549092DD
• When you die you do not lose the gun you currently have
  79BF9775
• Infinite lives
  7E1FF8A0
• Infinite lives on top-view levels
  029695DD
  02969880
• Start with 5 bombs on each life on side view levels
  00A2F105
  019B9705
• Start with 9 bombs on each life on side view levels
  00A2F109
  019B9709
• Start with 5 bombs on each life on top view levels
  00A6F105
  028EED05
• Start with 9 bombs on each life on top view levels
  00A6F109
  028EED09