Petey Piranha, as seen in Super Mario Sunshine

Petey Pirahna (Boss Packun in Japan) is a fictional villain in Nintendo's Mario franchise. He first appears as the primary boss of Bianco Hills in Super Mario Sunshine. He has since appeared as a boss in games such as Super Princess Peach, Mario & Luigi: Partners in Time, New Super Mario Bros. and Super Smash Bros. Brawl. He also acts as a playable character in spin-off Mario games like Mario sports games and in Mario Kart: Double Dash!!. A dinosaur-like version of him called Dino Pirahna also appears as the first episode boss in Super Mario Galaxy.

Petey is a larger, much more powerful version of a Piranha Plant, which is the result of mutation. Whereas normal Piranha Plants usually grow from pipes, Petey's leaves and roots have grown into foot-like and arm-like appendages. He can also use his leaves to fly around in the air and create massive tornadoes. Furthermore, Petey sports a pair of white-spotted red briefs. Although Petey does not speak, he does make some growling, drooling and licking noises, which translate into actual speech. Petey frequently vomits out mud-like Earth Goop, a substance similar to that of Shadow Mario's Paintbrush, which can make the ground slippery and sometimes generate more goop-based monsters.