The Yamashina (山階宮, Yamashina-no-miya) (princely house) was the third oldest collateral branch (ōke) of the Japanese Imperial Family created from the Fushimi-no-miya, the oldest of the four branches of the imperial dynasty allowed to provide a successor to the Chrysanthemum throne should the main imperial line fail to produce an heir.
On October 14, 1947, Prince Yamashina Takehiko lost his imperial status and became an ordinary citizen, as part of the American Occupation's abolition of the collateral branches of the Japanese Imperial family. On his death without heirs in 1987, the main line of the Yamashina-no-miya became extinct.
The Yamashina name was carried on by Prince Yamashina Takehito's younger brother, Marquis Yoshimaro Yamashina, the noted ornithologist.
The Yamashina-no-miya palace was located in the Kōjimachi district of Tokyo.
