The Doctor's TARDIS contained an extensive library.
It greatly varied in appearance. (COMIC: The Mark of Mandragora, PROSE: The Dimension Riders, TV: Journey to the Centre of the TARDIS)
For a time, the TARDIS control room contained a library, (TV: Doctor Who, COMIC: Endgame, AUDIO: Storm Warning) but, even during that time, the Doctor had a separate library as well. (PROSE: War of the Daleks, AUDIO: The Man Who Wasn't There)
The Master's TARDIS also contained a library. (PROSE: The Quantum Archangel)
Appearance
At one point, the walls of the library were covered in dark roundeled wood. (AUDIO: The Man Who Wasn't There)
Anji Kapoor thought that the library was "like some sort of optical illusion, with shelves disappearing into the far distance". (PROSE: Escape Velocity)
History
Vicki Pallister used the library to research the United States of America. (PROSE: The Schoolboy's Story)
Adric read every single book on mathematics in the entire library. (AUDIO: Zaltys)
The Sixth Doctor and Melanie Bush in the TARDIS library. (PROSE: The Deal)
On one occasion, the Sixth Doctor visited the library to check his address book and find the location of Vertipax. (PROSE: The Deal)
Ace once sorted through the library. (AUDIO: Genocide Machine)
Bernice Summerfield once used the library to research the Shovoran dynasty. (PROSE: St Anthony's Fire)
When Anji Kapoor went into the TARDIS for the first time, she glanced into the library and was astounded by its size and messiness. (PROSE: Escape Velocity)
The Eighth Doctor and Charlotte Pollard once successfully sought out Pieter Montmarche: A Diary of Discovery in the library's children's literature section. (AUDIO: The Man Who Wasn't There)
When the Eighth Doctor, Lucie Miller, Susan, and Alex Campbell were attacked by a Blitzen fish during Christmas dinner inside the TARDIS, the library was among the rooms they were chased through. (AUDIO: Relative Dimensions)
When the Eleventh Doctor crashed the TARDIS shortly after his regeneration, the swimming pool fell into the library. (TV: The Eleventh Hour)
While on the run from time zombies, Clara Oswald accidentally found the library and had a look through The History of the Time War. (TV: Journey to the Centre of the TARDIS)
While talking to Bill, the Twelfth Doctor mentioned that the last time he went to the TARDIS library, Hattie was attacked by the 1986 Bash Street Kids annual. (PROSE: The Shining Man)
Collection
The library's books included Brave New World, (PROSE: The Wheel of Ice) Jane's Spaceships, (PROSE: War of the Daleks) Jane's Spacecraft of the Universe, Aladdin: The Script, Parachuting, A-Z of Planets, VNR The Collection, Timeview, The Time Machine, Collected Works of Beatrix Potter, The Baker's Dozen, Corpse, Vegetarian Cook, Vanity Fair, Freeman: Editorial Decision, The Early Years, a book on aerobics, (PROSE: The Deal) Every Gallifreyan Child's Pop-Up Book of Nasty Creatures From Other Dimensions, (PROSE: All-Consuming Fire) Robinson Crusoe, (PROSE: Heart of TARDIS) Wisden Almanack, (PROSE: Fear of the Dark) War and Peace, (PROSE: The Deal, AUDIO: Terror Firma) The Wonderful Wizard of Oz, The I-Spy Book of British Birds, Can you forgive her?, You Only Live Twice, Frankenstein, (AUDIO: Storm Warning, Zagreus) Pieter Montmarche: A Diary of Discovery, The Little Book of Starships, (AUDIO: The Man Who Wasn't There), the only signed copy of The Quarry in the universe (PROSE: Keeping up with the Joneses) and a signed copy of Reminiscences of the Peculiar by George Litefoot. (AUDIO: The Carrionite Curse)
Some of the library's history books included A History of the Varaxil Hegemony, (AUDIO: The Witch from the Well) Histories of the Dalek Imperium, (PROSE: Keeping up with the Joneses) The History of the Time War, (TV: Journey to the Centre of the TARDIS) A Brief History of Time, (PROSE: Fear of the Dark) and Fashion Through the Ages. (PROSE: The Deal)
The Demonology and Witchcraft section contained books by an author named Rowling. (AUDIO: The Carrionite Curse)
Books kept in the library which were of personal significance to the Doctor included a signed copy of The Murder of Roger Ackroyd gifted to him by Gemma and Samson Griffin (AUDIO: Terror Firma, Terror Firma) and his Five Hundred Year Diary. (PROSE: The Deal, AUDIO: The Young Lions)
He had several books by writers such as Capek, Capote, (AUDIO: Zagreus, PROSE: The Blood Cell) Carroll, (AUDIO: Zagreus) and Shakespeare. (PROSE: The Deal, The Dimension Riders)
The contents of the library were not limited to books. It also contained the liquid Encyclopedia Gallifreya (TV: Journey to the Centre of the TARDIS) and diskettes with the complete works of the 21st century environmentalists. (PROSE: The Dimension Riders)
The section of the library devoted to children's literature was "ridiculously small". (AUDIO: The Man Who Wasn't There)
Behind the scenes
The incomplete television story Lost in the Dark Dimension would have featured the TARDIS library for a significant portion of the story. Set in an alternate timeline where the Fourth Doctor never regenerated and the TARDIS was mostly destroyed, the library would have been the last fragment of the ship remaining, camouflaged as a small church.
