Kōtsu-ji, Buddhist temple in Yoshinogawa, Japan

Kōtsu-ji is a Shingon Daikaku-ji school temple at the summit of Mount Kōtsu, the peak also called Awa-Fuji, in Yoshinogawa, Tokushima Prefecture. Its main image is Zao Gongen, known here as Kōtsu Daigongen, with a Senju Kannon as side image. The temple stands within the Tsuchi-hashi Kōtsu Prefectural Natural Park, and the mountain also bears the names Kinugasa-yama and Manishu-san.

Kōtsu-ji stands on the summit of Mount Kōtsu, called Awa-Fuji, and tradition recorded in 1665 by the abbot Yūson credits its founding to En no Gyōja, though the text itself doubts this. Documents from Ryōzō-in show a Shugendō faith centred on the mountain by the Kamakura period. The temple also served as bettō of Ibi Shrine in Yamazaki, producing a local Ibi Shugendō form.

The temple also served as bettō of Ibi Shrine in Yamazaki, Yamakawa-chō, whose meetings were held twice a year for the Awa Inbe clan's guardian deity. This produced a distinctive form of Inbe Shugendō. The mountain is called Nishi-kamiyama, in contrast to Mount Ōmine in Yamato to the east.

Kōtsu-ji stands on the summit of Mount Kōtsu, reached by car about 50 minutes from JR Awa-Yamakawa Station on the Tokushima Line, or about 70 minutes by car and on foot from the Waki-machi Interchange on the Tokushima Expressway. The final stretch is a mountain path, so allow time and wear shoes suited to walking uphill.

Kōtsu-ji sits on the summit of Mount Kōtsu, nicknamed Awa-Fuji, and calls itself Nishi-Kamizan in contrast to Mount Ōmine in Yamato to the east; it is described as the birthplace of Shugendō in Awa Province. The temple also served as bettō of Ihibe Shrine in Yamazaki, holding two meetings a year.