Marriage

Marriage was the union of persons. It was usually made formal by a wedding service.

Donna Noble's marriage to Lance Bennett was prevented when the huon particles within her caused her to vanish while walking up the aisle. (TV: The Runaway Bride) She later married Shaun Temple and received a lottery ticket from the Tenth Doctor as a wedding present. (TV: The End of Time)

After Amy Pond and Rory Williams were married, Amy remembered the Eleventh Doctor back into existence. (TV: The Big Bang)

The Trickster arranged for Sarah Jane Smith to meet and fall in love with Peter Dalton. Once they were married, she would forget about defending the Earth and the Trickster could feed on the chaos. Peter revoked his deal with the Trickster, thus defeating it. (TV: The Wedding of Sarah Jane Smith)

Madame Vastra and Jenny Flint described themselves as married. However, given they lived in Victorian London, it is unclear whether this was ever made official. (TV: The Snowmen; Deep Breath)

Jack Harkness is known to have been married to a woman at least once. (TV: Children of Earth)

During a shared dream with the Twelfth Doctor, Clara Oswald once stated that other than Danny Pink, she could only imagine marrying one other man, "but he was impossible". (TV: Last Christmas) Earlier in her travels with the Doctor, Clara received a wedding proposal from Emperor Ludens Nimrod Kendrick Cord Longstaff XLI (a.k.a. "Porridge"), but she declined his offer. (TV: Nightmare in Silver)

Several of the Doctor's companions are known to have married following their travels with him. Examples include Peri Brown marrying King Yrcanos (TV: The Ultimate Foe); Martha Jones and Mickey Smith (TV: The End of Time); Ian Chesterton and Barbara Wright (TV: Death of the Doctor, COMIC: Hunters of the Burning Stone); Ben Jackson and Polly Wright (Death of the Doctor); Jo Grant and Clifford Jones (TV: The Green Death, Death of the Doctor); and Vicki Pallister to Troilus (TV: The Myth Makers). By the time he encountered the Seventh Doctor in the 1990s, Brigadier Lethbridge-Stewart had finally married his longtime girlfriend, Doris (TV: Planet of the Spiders, Battlefield).

The Doctor is known to have been married at least four times (TV: Death in Heaven). This list includes Cleopatra, Elizabeth I, Marilyn Monroe and River Song (TV: The Husbands of River Song, The Day of the Doctor, A Christmas Carol, The Wedding of River Song). River, for her part, engaged in polygamy during her marriage with the Doctor, marrying Ramone, Stephen Fry and King Hydroflax while married to the Doctor, though the marriage to Hydroflax was part of a scam to retrieve a rare diamond he contained within his body armour. (TV: The Husbands of River Song)

Behind the scenes
Although there have been many occasions in which married couples have been involved with Doctor Who and related productions in front of and behind the lens or microphone, a few real-life marriages worth noting include Jon Pertwee and Jean Marsh (who were married in the 1950s, years before either appeared on the series); Tom Baker and Lalla Ward (who wed during a break in production on TV: The Keeper of Traken but divorced a year and a half later); and David Tennant and his TV: The Doctor's Daughter co-star Georgia Moffett (also the daughter of Peter Davison). Caroline John was also married to Master actor Geoffrey Beevers until her death.