Sū Yàn 蘇彥 (fl. 4th century) was an Eastern Jìn 東晉 literatus, best known in the broader bibliographic record as the putative author of the early Bù qián tiān 步天歌 (the astronomical-mnemonic verse later associated with the Suí–Táng astrologer Wáng Xīmíng 王希明). The Suí shū jīngjí zhì 隋書經籍志 attributes a Sūzǐ 蘇子 to him. His exact birth and death years and his office record are not preserved in the standard histories; the dynastic placement under Jìn follows the Suí shū and the Yìwén lèijù. CBDB has no entry.
In the Kanripo corpus he is the attributed author of KR3a0138 Sūzǐ 蘇子.