The Crimson Ghost is a 1946 American film serial directed by Fred C. Brannon and William Witney. Produced by Republic Pictures and written by Albert DeMond, Basil Dickey, Jesse Duffy, and Sol Shor, it was the last serial directed by Witney. It is divided into twelve chapters and stars Charles Quigley as a criminologist who attempts to thwart the efforts of the eponymous villain to steal a device that can render electrical devices powerless. The serial also stars Linda Stirling, Clayton Moore, and I. Stanford Jolley.

In the 1950s, the serial was re-edited as a six-episode television series, and in 1966, it was re-edited and re-released as a television film titled Cyclotrode X. By the 1990s, The Crimson Ghost was one of two Republic serials to be colorized.

The serial's titular villain, the Crimson Ghost, has become a pop-culture icon due to the punk rock band Misfits having adapted his skull-like visage into their iconography.