Sūn Bìn 孫臏 (d. ca. 316 BCE) — Warring States military strategist who served the state of Qí 齊. His personal name is unknown; Bìn 臏 is an epithet derived from the mutilation (excision of the kneecaps, one of the five punishments, wǔxíng 五刑) inflicted on him in the state of Wèi 魏. Born in the Juān 鄄 region (modern Juancheng county 鄄城, Heze, Shandong), he is traditionally regarded as a descendant of the Sūnzǐ author Sūn Wǔ 孫武 (孫武). He studied under the hermit strategist Guǐgǔzǐ 鬼谷子, alongside Páng Juān 龐涓.
After Páng Juān framed him for treason while both were serving Wèi, Sūn Bìn was disfigured and imprisoned. He escaped to Qí with the help of a Qí envoy, where General Tián Jì 田忌 presented him to King Wēi 威王 (r. 357–320 BCE). Unable to command troops in the field owing to his disability, he served as a staff strategist. He is credited with advising the feigned-retreat and diminishing-cookfire stratagem that lured Páng Juān into the ambush at Mǎlíng 馬陵 (341 BCE), destroying the Wèi army and killing Páng Juān. His subsequent fate is unknown.
His treatise, the Sūn Bìn bīngfǎ 孫臏兵法 (KR3b0025), was listed in the Hàn shū yìwén zhì in 89 chapters (piān) but lost by the Táng–Sòng period. Its rediscovery at Yínquèshān 銀雀山 in 1972 (16 chapters + supplementary texts) settled long-standing doubts about whether Sūn Bìn had existed as a person distinct from the Sūnzǐ author.
No CBDB entry found for Sūn Bìn in the local database (the entries for 孫賓 in CBDB refer to later homonyms).