Doctor X may refer to:

• Doctor X (film), a 1932 Technicolor film starring Lee Tracy, Fay Wray and Lionel Atwill
• Alan E. Nourse, who used "Doctor X" as the pseudonym of his 1965 journal Intern
• Doctor X (wrestler), ring name of Mexican professional wrestler Clemente Valencia
• "Doctor X", a ring name of professional wrestler Dick Beyer
• "Doctor X", a ring name of professional wrestler Tom Prichard
• Dr. X (Action Man), the arch-enemy of the 1993–2006 Action Man revival toy line
• Dr. X, a pseudonym for Doctor Mario Jascalevich, accused of several patient murders
• Dr. X, the primary antagonist of the Queensryche albums Operation: Mindcrime and Operation: Mindcrime 2
• Dr. X, a mysterious illicit nanotechnology specialist from Neal Stephenson's novel The Diamond Age
• Doctor-X (TV series), a Japanese medical drama
• Ted Mosby, How I Met Your Mother character whose aliases include Doctor X

• Mister X (disambiguation)

This disambiguation page lists articles associated with the title Doctor X.
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