An alarm clock was a device, usually a clock, which made a loud noise at a predetermined time in order to wake up a sleeping individual.

Among the people who used alarm clocks were Bruce and Miranda, (TV: Doctor Who) Rose Tyler, (TV: Rose) Gwen Cooper (TV: Something Borrowed) and Amy Pond. (TV: The Eleventh Hour) Trix MacMillan had a Mickey Mouse alarm clock in the TARDIS which had belonged to Anji Kapoor. (PROSE: Halflife) The Third Doctor told Sarah Jane Smith that his rhondium sensor was an alarm clock. (TV: The Time Warrior) Father Time used a giant alarm clock to render the Second Doctor and Jamie McCrimmon unconscious. (COMIC: Father Time)

The Fourth Doctor called the systems which would have revived the Nerva Beacon's humans their alarm clock. (TV: The Ark in Space) The Eighth Doctor likened piloting the TARDIS to setting an alarm clock, but Grace Holloway said she wasn't any good at setting alarm clocks. (TV: Doctor Who) The Eleventh Doctor realised that the mummy was not the "grandfather" that Merry Gejelh was to be sacrificed to, but in fact, functioned as Grandfather's alarm clock. (TV: The Rings of Akhaten)

The Eighth Doctor had an alarm clock from Somnambulos IV which woke up the sleeper by scrambling their sensory centres. He used it against the Celestial Toymaker and Marwood in Stockbridge. (COMIC: Endgame)

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