The Wiggler Bus is a type of traffic vehicle found driving around city courses in the Mario Kart franchise. Like the majority of traffic vehicles in the Mario Kart series, they are a hazard. They also represent the Green Wiggler from "Super Mario Sunshine". Wiggler buses appeared in the "Mario Kart: Double Dash!!" stages Mushroom Bridge and Mushroom City.
Unlike cars, If you hit a Wiggler Bus while using a super star power-up, You will ricochet off of it. The bus is colored green because this was the color of wigglers at the time. Yellow wigglers first appeared in Mario Kart Wii as a hazard, and appeared as the character Wiggler in Mario Kart 7. The wiggler bus was the first reference to Wigglers in the Mario Kart (series).