约翰·迪伊（英语：John Dee，1527年7月13日－1608年）为英国著名数学家、天文学家、占星学家、地理学家、神秘学家及伊丽莎白一世顾问。他把自己一生大部分时间献给炼金术、占卜、以诺魔法、及赫耳墨斯哲学。

他常常凝视着科学与神秘的世界，犹如两者渐渐变得可以分辨的。他曾经以20余岁的年纪在巴黎大学的大堂授课。他热衷于推广数学，更成为一个受人尊重的天文学家，在英国海外探索方面也是一名专家，为很多人员提供训练。「大英帝国」一词就是他创造的。

John Dee (13 July 1527 – 1608 or 1609) was an English mathematician, astronomer, astrologer, occult philosopher, imperialist, and adviser to Queen Elizabeth I. He devoted much of his life to the study of alchemy, divination, and Hermetic philosophy.

Dee straddled the worlds of science and magic just as they were becoming distinguishable. One of the most learned men of his age, he had been invited to lecture on the geometry of Euclid at the University of Paris while still in his early twenties. Dee was an ardent promoter of mathematics and a respected astronomer, as well as a leading expert in navigation, having trained many of those who would conduct England's voyages of discovery.