Wilfred "Wilf" Mott is a recurring fictional character in the British science fiction television series Doctor Who, played by Bernard Cribbins. He is the grandfather of the Tenth Doctor's companion Donna Noble, and father of her mother, Sylvia Noble. As companion to the Doctor, an alien Time Lord from the planet Gallifrey, Donna travelled through space and time in the show's 2008 series, having numerous adventures. A believer in extraterrestrial life himself, Wilfred was proud of his granddaughter's adventures and helped to keep them a secret from her overbearing mother. He later became the Tenth Doctor's final companion in "The End of Time".

Cribbins was originally intended to appear only in the 2007 Christmas special, "Voyage of the Damned", but when Howard Attfield was forced to retire from his role as Donna's father, Geoff Noble, due to illness (Attfield subsequently died), creator Russell T Davies reconceived Cribbins' role as Donna's grandfather and replaced Attfield with him for the fourth series. In May 2022, Cribbins was reportedly due to reprise the role for the series' 60th anniversary specials in 2023, having been spotted on the set of the specials. "Wild Blue Yonder", the special episode Cribbins appears in, marked his final acting role before his death on 27 July 2022; the episode is dedicated to his memory. Wilfred briefly appears in "The Giggle", portrayed by an uncredited stand-in and featuring usage of an archival audio recording of Cribbins from the 2008 episode "The Poison Sky".

Wilfred Mott first appears in "Voyage of the Damned" (2007). A British Army veteran, he mans a newspaper stand and is one of the few people to remain in a deserted London over Christmas following the bizarre events during Christmas in recent years. He is a staunch monarchist and wears the badge of the Parachute Regiment on his beanie, Cribbins himself wore the same badge during his National Service. The Doctor and Astrid Peth meet him shortly after teleporting down to Earth, before witnessing them disappearing back to the intergalactic cruiser Titanic.

In the episode "Partners in Crime", Wilfred is revealed to be an amateur astronomer who spends his evenings stargazing with his telescope from an allotment. He has an interest in alien conspiracies and is somewhat eccentric in his beliefs. He has a good relationship with his granddaughter, Donna Noble (who calls him "gramps"), morally supporting her in contrast to Sylvia's berating and nagging, and he is joined by Donna on the allotment when she wishes to escape this. After Donna sets off with the Doctor, they make a fly-by of the allotment in the TARDIS, its door open, astonishing Wilfred. Donna waves to him from the TARDIS door and he is jubilant to see that she is following her desire for adventure.

In "The Sontaran Strategem", Wilfred is reunited with his granddaughter and the Doctor, whom Donna is shocked to learn he has met previously. His absence in "The Runaway Bride" is explained by being ill with what he believed to be Spanish flu. When the ATMOS devices activate, he is trapped in the family car where the Doctor and Donna try to rescue him. In "The Poison Sky", Sylvia saves him by smashing the windscreen with an axe kept by the front door of her house. Despite seeing first-hand the risks of travelling with the Doctor, he nevertheless continues to support Donna in doing so.

In a parallel world in "Turn Left", in which the Doctor died without ever meeting Donna, Donna wins a holiday for her family in the country, Wilfred is thus not at his news stand at Christmas as otherwise depicted in "Voyage of the Damned". Without the Doctor, the interstellar cruiser Titanic crashes into Central London, obliterating the metropolis in a massive nuclear explosion. Following the disaster, the United States pledges much-needed aid to the collapsing United Kingdom; Wilfred, trying to remain optimistic, remarks "God bless America!", though the anticipated aid is cancelled after millions in the U.S. are killed as a result of Miss Foster's selection of the U.S. as a breeding ground for the Adipose. Wilfred and his family are evacuated to Leeds with countless other refugees. They share an apartment with an Italian immigrant family, initially annoying the Nobles, but the two families quickly befriend. This friendship is short lived, however, as Wilfred becomes distraught when Rocco and his family are moved from Leeds to a labour camp when a new far-right government places Britain under martial law; he notes "that's what they called them last time," alluding to Nazi concentration camps during World War II. A reference to Wilfred's military service is made in this episode, his friend Rocco calls him "my capitano" and salutes him solemnly as he is taken away.

In "The Stolen Earth", Wilfred takes it upon himself to fight the Daleks. Armed with a paintball gun, he reasons that shooting them in their eyepiece will blind them, however upon doing so the Dalek effortlessly dissolves the paint. He and Sylvia are rescued from the Dalek by Rose Tyler, who destroys it and returns with them to their home to try to contact the Doctor. Due to Wilfred not owning a webcam, his computer can only provide Rose with one-way communication of former Prime Minister Harriet Jones' video conference with her militia of the Doctor's companions. Wilfred is impressed by Harriet, remarking he voted for her, only for Sylvia to reject this. He watches in shock as Harriet is exterminated by the Daleks on the computer.

In "Journey's End" because Donna's memory was wiped, Wilfred sees the Doctor off on her behalf and promises whenever he looks up at the stars, he'll think of the Doctor, considering him a very close friend. Against Sylvia's claims that Donna was just as good before travelling with the Time Lord, Wilfred stands his ground and maintains to his daughter that the Doctor made Donna a better person. While he agrees to keep the Doctor a secret, he also promises to keep watch for him in Donna's place in memory of his actions.