Christopher Magnay (bapt. 6 October 1767 – 27 October 1826) was an English merchant who was Lord Mayor of London from 1821–22.
Magnay was the son of John Magnay and Ann Liddle of Haltwhistle, Northumberland, where he was baptised in October 1767. He was a City of London merchant and a member of the Worshipful Company of Merchant Taylors. In 1809, he was elected an alderman of the City of London for Vintry ward. He was Sheriff of London from 1813–14. He was master of the Stationers Company from 1816–17. In 1821, he was elected Lord Mayor of London.
Magnay was the father of William Magnay, who became a baronet.