|First appearance||Super Mario Bros. 3 (1988)|
|Latest appearance||Super Mario Maker 2 (2019)|
Giant cannonballs, also referred to as massive cannon balls or huge bullets, are very rare moving obstacles found in Super Mario Bros. 3, New Super Mario Bros. Wii, and New Super Mario Bros. U. They are much faster and bigger than the original cannonballs, making them harder to avoid. In Super Mario Bros. 3, they appear only in Dark Land's first tank level and the battleship level. The cannons that fire the giant cannonballs resemble Warp Pipes, but they are colored black (blue in reissues) so as not to confuse the player. In New Super Mario Bros. Wii, they appear only in World 8's Airship. In New Super Mario Bros. U, they appear only in The Mighty Cannonship from Soda Jungle. Even though normal cannonballs are absent from New Super Luigi U, giant cannonballs reappear in the level Bowser Jr. Showdown.
Giant cannonballs reappear in Super Mario Maker, Super Mario Maker for Nintendo 3DS, and Super Mario Maker 2. The player can enlarge a normal Cannon with a Super Mushroom, which enables it to fire giant cannonballs. The second official course created by Bowser, named Bowser's Cannonball Run, involves Mario running to keep a giant cannonball onscreen until the end.
- Hodgson, David S J. Super Mario Advance 4: Super Mario Bros. 3 Prima's Official Strategy Guide. Page 100. "When you drop to the area on the large turret's right, leap over the giant cannonball before you leap over the water to the next ship."
- Hodgson, David S J. Super Mario Advance 4: Super Mario Bros. 3 Prima's Official Strategy Guide. Page 99. "Leap on the turret that's grazing on the ground, wait for the turret above to fire a massive cannon ball, then land on the turret top and deal with another Rocky Wrench."
- Nintendo Power Volume 13, page 75. "Bring Out The Big Guns! This giant cannon shoots two huge bullets in rapid succession. Either jump on its barrel or duck quickly!"