The Unseen University (UU) is a school of wizardry in Terry Pratchett's Discworld series of fantasy novels. Located in the fictional city of Ankh-Morpork, the UU is staffed by mostly indolent and inept old wizards. The university's name is a pun on the Invisible College, and many aspects of the university are references to Oxford and Cambridge University. The exploits of the head wizards of the Unseen University are one of the main plot threads in the long-running fantasy series, and have played a central role in 13 novels to date, as well as the four supplementary Science of Discworld novels and the short story, A Collegiate Casting-Out of Devilish Devices.

Sir Terence David John Pratchett was an English author, humorist, and satirist, best known for his 41 comic fantasy novels set on the Discworld, and for the apocalyptic comedy novel Good Omens (1990) which he wrote with Neil Gaiman.