Yú Sōng 俞松 (fl. ca. 1240–1244), zì Shòuwēng 壽翁, self-styled Wúshān 吳山, was a late-Southern-Sòng Lántíng xù connoisseur from Qiántáng 錢塘 (Hángzhōu). His one surviving work is the Lántíng xùkǎo 蘭亭續考 KR2n0023 in 2 juan, dated by his postscript “jiǎchén in the Jǐngōu Hall” — i.e. Chúnyòu 4 (1244). The colophons of Lǐ Xīnchuán 李心傳 within the work are dated Chúnyòu 1–3 (1241–1243), preserved from Lǐ’s late residence at Línān after his Shàoxīng-era bàcí 罷祠 retirement. The catalog meta gives “fl. 1065” but this is an obvious error — the Lǐ Xīnchuán colophons fix the work to the 1240s. The Sìkù tíyào notes a separate Yú Tíngchūn 俞庭椿 with the same zì Shòuwēng who must be distinguished from this man. Yú Sōng’s official career is otherwise undocumented, except that one of the imperial copy-colophons identifies him as chéngyì láng 承議郎.