Xīdí 希迪 (active early 13th c.), Southern Sòng Buddhist scholar-monk active at the Huìyīnsì 慧因寺 in Wǔlín 武林 (modern Hángzhōu — the same monastery that had been 淨源 Jìngyuán’s centre). Per the DILA Authority entry (A000487), he composed the Zhù huáyán tóng jiào yī chéng cè 註華嚴同教一乘策 in 1 fascicle in Jiātài 嘉泰 2 (1202), and in Jiādìng 嘉定 11 (1218) — when he had become abbot of the Huìyīnsì — composed the [[KR6e0079|Huáyán yī chéng jiào yì fēn qí zhāng jí chéng jì 華嚴一乘教義分齊章集成記]] (X999). He also compiled the [[KR6e0080|Píng fù gǔ jì 評復古記]] (X1000), a critical commentary on 師會 Shīhuì’s [[KR6e0078|Fù gǔ jì]] (X998). His birth and death dates are not preserved.