To provide an industrially advantageous method for producing alumina having a high bulk density at a high volume efficiency.

The method for producing alumina comprises the steps of: mixing an aqueous medium in an amount of ≥20 to ≤300 pts.wt. with 100 pts.wt. of a first dry powdery aluminum hydroxide prepared by an aluminum alkoxide method to obtain a wet powdery aluminum hydroxide; drying the wet powdery aluminum hydroxide by an agitation drying system to obtain a second dry powdery aluminum hydroxide; and calcining the second dry powdery aluminum hydroxide to obtain alumina.