Mechazaurus (メカザウルス Mekazaurusu) is a giant Brachiosaurus-like robot who is the boss of the first Wily Castle stage in Mega Man 6. Wily based this robot on an enemy from a video game he played as a child.
It attacks by spitting fireballs and shoots platforms from its chest. The weak spot is its eyes, but they can be hard to hit at times. If Mega Man is equipped with the Rush Power Adapter, he can charge up his punch to hit the platforms back at the Mechazaurus, dealing 1 point of damage each time. The player can also ride the platforms up and shoot its eyes with Yamato Spear, which is the Special Weapon that it takes the most damage from.
- Mechazaurus' name and design is a possible homage to the monsters of the week of the same name in the 1974 anime Getter Robo.