Ururuun (ウルルーン,Ururuun?) is the miniboss in Grenade Man's stage from Mega Man 8. It's a giant eye that attacks by tackling Mega Man or dumping junk above him. It surfaces from the junk pile that is its arena and surrounds itself with layers of junk which can be destroyed. Astro Crush seems to be its weakness, but Tornado Hold is also a good weapon against Ururuun, since it destroys the barrier around it fast and deals damage at the same time. Defeating it gives Mega Man the Rush Bike.
Its name is derived from the Japanese onomatopoeia "ururun", which describes drooping, weeping eyes.