Déyún 德雲 (fl. Liao dynasty, dates unknown) was a Liao-dynasty Buddhist monk based originally at Chóngrén Monastery 崇仁寺 in Ānjìn Fu 析津府 (present-day Beijing), who became the principal compiler of the Yīqiè fó púsà míng jí 一切佛菩薩名集 (KR6i0028, F1072), the most comprehensive pre-modern catalogue of all Buddhist names in the Chinese canon.
According to the preface by 思孝 (Sīxiào) of Jiuéhuā dǎo Hǎiyún sì 覺花島海雲寺, Déyún came from a literati family in Bǎojìng (保靜; present-day area north of Beijing), with the secular clan name Qīnghé 清河. He pursued a classical education in poetry and scholarship before renouncing the world at Chóngrén Monastery in Ānjìn Fu 析津府, where he received the śrāmaṇera vows. He eventually settled at the Tàizǐ Zhāodǒutí dòu 太子招鬪提逗 at Yǒngchāng 永昌 military prefecture. His project of extracting Buddha-names and bodhisattva-names from the entire Tripiṭaka (present, past, and future in systematic order) resulted in the Yīqiè fó púsà míng jí in twenty fascicles; the monk Fēizhuó 非濁 subsequently added two more fascicles extending the compilation, making a total of twenty-two fascicles preserved in the Fangshan Stone Canon (房山石經).
Note: the DILA authority lists three persons named 德雲; the Liao dynasty compiler of F1072 is A040021. A second entry (A036693) refers to an altogether different person (the bodhisattva-teacher of Sudhana in the Gaṇḍavyūha, known as Gōngdé Yún 功德雲), which is a canonical figure, not a historical monk.