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Series 6 is an ambiguous term on this wiki, since many things could be considered "the sixth series" of a particular programme. It may mean:
- Season 6, the 1968-1969 series of Doctor Who, Patrick Troughton's final season as the Second Doctor.
- Series 6 (Doctor Who), the 2011 series of Doctor Who, which was Matt Smith's second series as the Eleventh Doctor.