Hōon-ji, Buddhist temple in Amagasaki, Japan

Hōon-ji is a Jōdo-shū Chinzei-ha temple in Teramachi, Amagasaki, with the mountain name Keikōzan and the cloister name Shatoku-in. Its main image is Amida Nyorai, and the temple is known as the place where Sasa Narimasa died by seppuku in 1588. A five-ringed stone stupa 88.7 cm tall marks his grave in the main hall.

Hōon-ji was founded by Gyokurensha Shōyo Ekō Hōon, who died in 1561. In 1588, Sasa Narimasa, held responsible for the Higo uprising, was confined by Toyotomi Hideyoshi and forced to commit seppuku here. During the Genna era (1615–1624), the temple was moved from Bessho-machi to its present site in Teramachi to make way for the construction of Amagasaki Castle.

Sasa Narimasa, a retainer of Oda Nobunaga and later lord of Higo, was forced to commit seppuku at this temple on the 14th day of the fifth month of Tenshō 16 (1588) by order of Toyotomi Hideyoshi. A five-ring stone stupa (gorintō) 88.7 cm tall in the main hall marks the site.

Hōon-ji stands at 5 Teramachi, Amagasaki, about six minutes on foot from Hanshin Amagasaki Station on the Hanshin Main Line. The grounds are entered through the outer gate facing the street, with the inner gate beyond it. The sources list no visitor parking, so arrive by train or bus.

In the main hall stands a five-tiered stone gorintō 88.7 cm tall, marking the spot where Sasa Narimasa was forced to take his own life on 14 May 1588 by the lunar calendar. The temple was founded by Gyokurensha Shōyo Ekō Hōon, who died in 1561.