Yamakuni (山国町, Yamakuni-machi) was a town located in Shimoge District, Ōita Prefecture, Japan.
On March 1, 2005 Yamakuni, along with the towns of Hon'yabakei and Yabakei, and the village of Sankō (all from Shimoge District), was merged into the expanded city of Nakatsu.
As part of its fusion with Nakatsu City, two elementary schools, Tsukinoki (槻木) and Mizobe (溝部), were closed and their students transferred to Misato in 2005.
Yamakuni is notable for its contribution to Japanese mythology in the form of the Yamaguni Yetii myth.
This tale, widely regarded as fictional, recounts the story of a local hunter who allegedly stalked, captured and skinned the famous Yetii, and mounted its hide above his hearth.