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Barthélemy de Quincy (died 1302), a marshal of the Knights Templar •
Charles Sevin de Quincy (1660? – 1738), a French artillery general •
Margaret de Quincy, Countess of Lincoln (c. 1206 – 1266), an English noblewoman •
Quatremère de Quincy (1755 – 1849), a French archaeologist and writer •
Robert de Quincy (c. 1140 – c. 1197), an English and Scottish nobleman •
Roger de Quincy, 2nd Earl of Winchester (c. 1195 – 1264), a Scottish earl •
Saer de Quincy, 1st Earl of Winchester (c. 1155 – 1219), also a Scottish earl == De Quincey ==