Brunei Darussalam, Cambodia, China (mainland), Hong Kong (China), Indonesia, Japan, Laos, Malaysia, Myanmar, North Korea (B), Philippines, Russia (Asian), Singapore, South Korea, Taiwan (China), Thailand, Timor-Leste (NB) (P), Vietnam.
Vagrant to Mongolia.
North-eastern China to Amurland and Ussuriland, Japan and Izu Is. Winters from southern and south-eastern China and Taiwan through Indochina and Malay Peninsula to Greater Sundas, Philippines, Sulawesi and islands off north-western New Guinea.
 
Population
Estimated population is 100,000 (2010).
Grey-faced Buzzard (Butastur indicus) [XC266721]
by Joshua Chong from Gornyy Khutor, Chernigovskiy rayon, Primorskiy kray, Russian Federation (call)
Grey-faced Buzzard (Butastur indicus) [XC446860]
by Okamoto Keita Sin from Tambon Wang Katha, Amphoe Pak Chong, Chang Wat Nakhon Ratchasima, Thailand (call)