The Gray Man

Grey man, The Gray Man or The Grey Man may refer to:

Concepts

Grey man theory, a concept in everyday carry that one should blend in with the environment so as not to raise suspicion

The primary nickname of American serial killer Albert Fish
A nickname of British Prime Minister John Major, known as the "grey man" of British politics

The Gray Man (2007 film), a biographical thriller starring Patrick Bauchau
The Gray Man (2022 film), an American film based on the 2009 Mark Greaney novel
D.Gray-man, a 2004 manga and anime series
The Gray Man (novel series), a series of spy novels by Mark Greaney (novelist)
- The Gray Man (novel), a 2009 novel by Mark Greaney, first in the series of novels
"The Grey Man", an episode of NCIS: Los Angeles
"The Gray Man" (short story), a short story by Bob Shaw
The Gray Man (2002 film), an action film co-starring Angelo Fierro
a passage from a serial version of H.G. Wells' The Time Machine which was deleted from the book version was later published under the title "The Grey Man"