In "Death in Heaven" Clara says the Doctor has been 'married four times, all deceased' when pretending to be him. However, he has been confirmed to have six wives, with a possible seventh. This count, however, varies on which stories you personally count as canon.
- Presumably Susan's grandmother (never seen)
- Patience ("Cold Fusion" (Virgin Missing Adventures novel #29), "The Infinity Doctors" (BBC Past Doctor Adventures novel #17), "Cold Fusion" (Big Finish audio story))
- Scarlette ("The Adventuress of Henrietta Street" (BBC Eighth Doctor Adventures novel #51))
- Elizabeth I ("The Shakespeare Code", "The End of Time", "The Beast Below", "The Day of the Doctor")
- Marilyn Monroe ("A Christmas Carol", "Night and the Doctor": "Good Night")
- River Song ("The Wedding of River Song")
- Cleopatra ("The Wedding of River Song")
There was also an episode called "The Doctor's Wife", but that title was a metaphor for the TARDIS.