The Dalek Factor is an original novella written by Simon Clark and based on the long-running British science fiction television series Doctor Who.

It features a Doctor whose incarnation is unspecified.

It was released both as a standard edition hardback and a deluxe edition featuring a frontispiece by Graham Humphreys.

Both editions have a foreword by Christopher Fowler.

The term "Dalek factor" is also used in the serial The Evil of the Daleks, as the opposite of the human factor.