Wāng Mèngdǒu 汪夢斗 (fl. late 13th century; zì Bǎofū 寳夫, hào Xìngshān 杏山 and Nányǐn 南隱) was a late-Sòng míngjīng 明經 scholar and Sòng-loyalist from Jīxī 績溪 in Huīzhōu (Xīn’ān 新安). In the Jǐngdìng 景定 period (1260–1264) he placed in the Jiāngdōng Transport-Commission míngjīng selection-examination and was appointed Acceptance Gentleman of the Carriage (Chéngjiéláng 承節郎) and Drafter in the Jiāngdōng Provincial Logistics Office (Sīzhìgànguān 司制幹官). Early in the Xiánchún 咸淳 period (i.e. shortly after 1265) he was transferred to the Bureau of History as Editing Reviser (編校); there, with Yè Lǐ 葉李 and a small group of younger officials, he joined the unsuccessful memorial impeaching Chancellor Jiǎ Sìdào 賈似道. When Yè Lǐ and his faction were convicted, Wāng withdrew from the capital and returned home to Huīzhōu.
After the fall of the Sòng in 1276, the senior loyalist minister Xiè Chāngyán 謝昌言 — by then nominally serving under the Yuán — recommended Wāng to Kublai Khan, who specially summoned him to Dàdū 大都 in early 1279. Wāng made the long northward journey, met Xiè (whom he chided in verse for accepting Yuán employment), and after roughly nine months in the new Yuán capital declined office and was released. The two-juàn Běiyóu jí 北遊集 KR4d0385 is the surviving fruit of that trip — verse itinerary of the conquered north, with appended remarks on his Classics lectures (Xìngshān zhāigǎo 杏山摭稿). After his return to Jīxī he is not heard from in office again; lifedates are not securely fixed in CBDB or in local gazetteers (CBDB 35267 records no birth/death years, only floruit indications in the 1260s–1280s). He is best understood as a contemporary of Wāng Yuánliàng 汪元量 and Xiè Fāngdé 謝枋得 — members of the small group of Sòng míngjīng and jìnshì loyalists who left a substantial verse record of the dynastic transition.