The present invention provides a method that can produce hexagonal plate-shaped zinc oxide that is thin and presents little variation in particle size. The method according to the present invention for producing hexagonal plate-shaped zinc oxide includes: a step (1) for preparing a mixed slurry containing starting zinc oxide particles, a zinc acetate solution, and a chloride; and a step (2) for subjecting the mixed slurry provided by step (1) to thermal ageing at 60°C to 100°C.