Funai Domain (府内藩 Funai-han?) was a Japanese domain of the Edo period. It is associated with Bungo Province in present-day Ōita Prefecture on the island of Kyushu.
In the han system, Funai was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields. In other words, the domain was defined in terms of kokudaka, not land area. This was different from the feudalism of the West.
Funai had been the castle of the Ōtomo clan; however, Toyotomi confiscated it during the lordship of Ōtomo Yoshimune. In 1600, Takenaka Shigetoshi, the cousin of Takenaka Shigeharu (Hanbei), received Funai Castle, and land rated at 20,000 koku; he had switched sides during the Sekigahara Campaign to support Tokugawa Ieyasu. The domain was then given to Hineno Yoshiakira in 1634; however, as he died heirless, the domain was given to the Matsudaira (Ogyū) clan. The Matsudaira clan remained lords of Funai until the Meiji Restoration.
The hereditary daimyo were head of the clan and head of the domain.