The Memory Cathedral: A Secret History of Leonardo da Vinci is a 1995 historical fantasy fiction novel by Jack Dann.

It follows Leonardo da Vinci constructing his flying machine and then travelling to the East.

[2] Dann's major historical novel depicts a version of the Renaissance in which Leonardo da Vinci actually constructs a number of his inventions, such as a flying machine, whose designs are well-known from his surviving sketches.

He later employs some of his military inventions during a battle in the Middle East, while in the service of a Syrian general – events which Dann projects into a year of Leonardo's life about which little is known.

Leonardo's memory cathedral functions in the narrative as a device through which he reviews his experiences as death approaches.