St. Cedd's College is a fictional college, created by Douglas Adams, of Cambridge University. It appears in the Doctor Who serial Shada, and in the novel Dirk Gently's Holistic Detective Agency.
It is the home of Professor Chronotis, a retired time traveller who appears in Adams' fiction, and—in the fictional universe—was also the college of Isaac Newton (who actually attended Trinity) and Samuel Taylor Coleridge (who actually attended Jesus). It was named after Saint Cedd, brother of Saint Chad, whom Gently describes as "one of the duller Northumbrian saints."
It is based somewhat on Adams's own college, St John's. For Shada, scenes at St. Cedd's were filmed on location at Emmanuel College.
||St Cedd’s College ... owes a little to my memories of St John’s College, Cambridge, although I’ve also borrowed indiscriminately from other colleges as well. The point is that St Cedd’s College is a completely fictitious assemblage, and no correspondence is intended between any institutions or characters in this book and any real institutions or people, living, dead, or wandering the night in ghostly torment.
Adams went to school in Brentwood where there is a St. Cedd's Church—Saint Cedd brought Christianity to Essex.
St Cedd's College is also mentioned in the Torchwood online game, made during the show's second series. It is said to be the college attended by Dr. John Winters, a fictional character within the game.