Gasan Jōseki (峨山韶碩 1275–23 November 1366) was a Japanese Soto Zen monk.

He was a disciple of Keizan Jokin, and his students included Bassui Tokushō, Taigen Sōshin, Tsūgen Jakurei, Mutan Sokan, Daisetsu Sōrei, and Jippō Ryōshū.

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