Saikyo-ji is a Buddhist temple in Otsu, Shiga, and is traditionally associated with Prince Shotoku.

Saikyo-ji serves as the head temple of the Tendai Shinsei sect.

The temple's guest hall is actually a relocated building from the original Fushimi-Momoyama Castle, giving visitors a rare chance to walk inside authentic castle architecture from the feudal era.

Akechi Mitsuhide, the samurai who betrayed Oda Nobunaga, rebuilt this temple after his lord had burned it down during the siege of Mt. Hiei. His family tomb still remains on the temple grounds today.