The third series of the revived British science fiction programme Doctor Who, and the twenty-ninth season of the show overall, was preceded by the 2006 Christmas special "The Runaway Bride".

Following the special, a regular series of thirteen episodes was broadcast, starting with "Smith and Jones" on 31 March 2007 and ending with "Last of the Time Lords" on 30 June 2007.

The series is connected by a loose story arc consisting of the recurring phrase "Vote Saxon", which ultimately is revealed to be the return of the Doctor's enemy Time Lord the Master, first played by Derek Jacobi before regenerating into John Simm.

[1] "Human Nature" is also the first instance of the Doctor's previous incarnations prior to his ninth being explicitly referenced in the revived era through the sketches in The Journal of Impossible Things.

[2] A 13-part animated serial, The Infinite Quest, was produced and broadcast as part of the children's programme Totally Doctor Who on CBBC, leading up to the finale of series 3.

[13] Recurring guest stars for the series included Adjoa Andoh, Trevor Laird, Gugu Mbatha-Raw and Reggie Yates, who portrayed Martha's family.

[16] Other guest stars included Thelma Barlow,[17] Ryan Carnes, Matthew Chambers, Chipo Chung, Christina Cole, Michelle Collins, Lenora Crichlow, Anthony Flanagan, Andrew Garfield, Lucy Gaskell,[18] Mark Gatiss,[17] Don Gilet, Jennifer Hennessy, Anna Hope, Gerard Horan, Jessica Hynes,[19] Dean Lennox Kelly, Matt King, Chris Larkin, Harry Lloyd, Eric Loren, Stephen Marcus, Roy Marsden, McFly, Alexandra Moen, Carey Mulligan, Michael Obiora, Ardal O'Hanlon, Travis Oliver, Sharon Osbourne, Sarah Parish, Angela Pleasence, Hugh Quarshie, Miranda Raison, Anne Reid, Finlay Robertson, Thomas Sangster, Rebekah Staton and Ann Widdecombe.

Euros Lyn, Charles Palmer, Richard Clark, James Strong, Graeme Harper, Hettie MacDonald and Colin Teague directed episodes in the series.

[13] Production blocks were arranged as follows:[30] An animated serial, The Infinite Quest, was also produced alongside the series and was broadcast as part of the CBBC programme Totally Doctor Who.