Megabunus is a genus of harvestmen in the family Phalangiidae. All occur in Europe, mostly in the vicinity of the Alps.
In Megabunus, the pedipalps are armed with strong ventral spines, especially on the femur, probably to hold fast to prey.
The genus name is derived from Ancient Greek mega "big" and -bunus, which is a common ending for certain opilionid genera.
There are eleven recognized species: