Jitsuun 實運 (1105–1160) was a Japanese Shingon master of the late Heian period, of the Daigo-ji Sanbō-in 醍醐寺三寶院 transmission line and the most prolific single-author ritual compiler of mid-12th-century Shingon. He was a senior disciple of Yōgon 永嚴 (1075–1151) and rose to senior monastic office at Daigo-ji. His ritual-encyclopedic project — comprising the fifteen-fascicle KR6t0190 Zhūzūn yào chāo, the ten-fascicle KR6t0191 Mìzàng jīnbǎo chāo, and the four-fascicle KR6t0192 Xuánmì chāo — totals twenty-nine fascicles and constitutes the largest single ritual-corpus by any individual author in the Heian period.
Together these three works systematise the mid-Heian Daigo Sanbō-in ritual transmission across multiple organizational axes: by ritual-purpose (Zhūzūn yào chāo), by secret-treasury content (Mìzàng jīnbǎo chāo), and by esoteric xuán core teachings (Xuánmì chāo).
Surviving works in the Kanripo corpus: KR6t0190 Shoson yōshō (15 fasc.); KR6t0191 Hizō konbōshō (10 fasc.); KR6t0192 Genpishō (4 fasc.).