Mount Miminashi, Mountain in Kashihara, Nara Prefecture, Japan.

Mount Miminashi rises approximately 140 meters above the Nara Basin as one of three peaks forming the Yamato Sanzan mountain range in the region. The three summits together create a distinctive geographic formation that shapes the landscape.

Some scholars argue Mount Miminashi is not natural but an ancient tomb shaped as a keyhole mound, since the Yamato Sanzan form an isosceles triangle and the Kojiki and Nihon Shoki mention the mountain only from Emperor Ingyō's reign. In 1908 Emperor Meiji reviewed military exercises from the summit, where a stone pillar marks the spot. The mountain was named a Japan Heritage constituent property on 24 April 2015.

The name Miminashi means "earless," explained as a mountain with nothing superfluous; the Man'yōshū also records it as "Miminashi-yama." A poem in the Man'yōshū asks that the pond of Miminashi not dry up, and its stone monument stands by the old pond in Miminashi-yama Park. The mountain appears in Man'yōshū poems by Naka no Ōe no Ōji and in a Kokin Wakashū poem playing on the mountain's name and the word kuchinashi (gardenia).

The trail starts at Miminashi-yama Park on the south side, where there is a public toilet. From the park entrance, the climb to the summit takes about 13 minutes; the path splits into a steep route past the torii of Miminashi Yamaguchi Shrine and a gentler route that loops around the hillside. Neither route is paved or barrier-free, and the summit has no viewpoint because it is not maintained.

The Yamato Sanzan form an isosceles triangle, a fact noted since early times and used to argue that Mount Miminashi was not natural but a modified kofun. The mountain has no crater despite being volcanic rock, which supporters of that theory explain as deliberate filling.