Keizan

is one of two of the Sōtō school of Zen Buddhism. The other is Eihei-ji temple in Fukui Prefecture. ''Fodor's'' calls it "one of the largest and busiest Buddhist institutions in Japan". The temple was founded in 740 as a Shingon Buddhist temple. Keizan, later known as Sōtō's great patriarch Taiso Jōsai Daishi, founded the present temple in 1321, when he renamed it Sōji-ji with the help and patronage of Emperor Go-Daigo. The temple has about twelve buildings in Tsurumi, part of the port city of Yokohama, one designed by the architect Itō Chūta.

Keizan Jōkin (, 1268–1325), also known as Taiso Jōsai Daishi, is considered to be the second great founder of the Sōtō school of Zen in Japan. While Dōgen, as founder of Japanese Sōtō, is known as , Keizan is often referred to as .