Picea koyamae (Koyama's spruce; Japanese: ヤツガタケトウヒ yatsugatake-tohhi) is a rare spruce, native to Akaishi Mountains and Yatsugatake Mountains, or Nagano and Yamanashi Prefectures in central Honshū, Japan, where it grows at 1500-2000 m altitude.It is a monoecious evergreen tree growing to 25 m tall, with a trunk diameter of up to 1 m. The shoots are orange-brown, with scattered pubescence.