Sekkō Sōshin 雪江宗深 (Ōei 15 → 1408; Bunmei 18 / 1486-06-26), Mid-Muromachi Japanese Rinzai-Zen master in the Myōshin-ji line of the Ō-Tō-Kan transmission. Style-name (字) Sekkō 雪江; dharma-name Sōshin 宗深. Posthumous title Butsunichi Shinshō Zenji 佛日眞照禪師, conferred by Emperor Go-Kashiwabara 後柏原天皇 in Eishō 2 / 1505-08-31 (永正二年八月二日), nineteen years after Sekkō’s death. Native of Mino 美濃 province.
Dharma-heir of Gitten Genshō 義天玄詔 (1391–1462), seventh-generation Myōshin-ji abbot, himself in the line of 義玄 Kanzan Egen (1277–1361). Sekkō became abbot of Ryōan-ji 龍安寺 at the invitation of the kanrei 管領 Hosokawa Katsumoto 細川勝元 (1430–1473), and successively abbot of Ryūhō / Daitoku-ji 龍寳大徳寺 (the imperial shidō assignment with purple-robe bestowal), Hōzan / Myōshin-ji 法山妙心寺 (where he served for several years and is regarded as the eighth-generation abbot and key restorer), and other major temples including Zuisen-ji 瑞泉寺 in Owari 尾, Ryūkō-ji 龍興寺 in Tanba 丹, Kaisei-ji 海清寺 in Settsu 攝, and Kannon-ji 觀音寺 in Kawachi 河. Sekkō produced four major dharma-heirs known as the Shihatsu 四派 (“Four Branches”) of Myōshin-ji — Toyō Eichō 東陽英朝, Keisen Sōryū 景川宗隆 宗隆, Gokei Sōton 悟溪宗頓 宗頓, and Tokuhō Zenketsu 特芳禪傑 — through whom every present-day Myōshin-ji Rinzai sub-school descends. The Ōnin civil war (1467–1477) destroyed Myōshin-ji during his abbacy; the temple’s subsequent rebuilding was substantially shepherded by Sekkō’s heirs.
His pagoda is at the Heibai-in 衡梅院 sub-cloister at Myōshin-ji.