Yuán Zhǔn 袁準 (fl. mid to late 3rd century), zì Xiàoní 孝尼, was a Western Jìn 西晉 official and ritualist, son of the celebrated Wèi minister Yuán Huàn 袁渙 (a native of Chénjùn 陳郡 Fúlè 扶樂, modern Hénán). His biographical record survives only as an appendix to his father’s biography in the Sānguó zhì 三國志 j. 11 and as scattered notices in the Jìn shū 晉書. He served at the Wèi court and continued under the Jìn, holding posts as Imperial Censor (給事中) and Grand Master of Splendid Happiness (光祿勳). He had a reputation as a serious ritualist (his ritual writings on mourning are repeatedly cited in Tōng diǎn 通典) and as a qín 琴 musician; the Shìshuō xīnyǔ 世說新語 anecdote in which Jī Kāng 嵇康 refused to teach him the Guǎnglíng sǎn 廣陵散 is the source of his most enduring fame.
In the Kanripo corpus he is the attributed author of two reconstructed zǐ-house works, KR3a0124 Yuánzǐ zhèngshū and KR3a0130 Yuánzǐ zhènglùn; the Suí shū jīngjí zhì lists his collected Yuánzǐ 袁子 in 19 juàn. CBDB has no entry. Exact birth and death years are not preserved.