Thief of Time is a fantasy novel by British writer Terry Pratchett, the 26th book in his Discworld series.

The Auditors hire young clockmaker Jeremy Clockson to build a perfect glass clock, without telling him that this will stop time and thereby eliminate human unpredictability from the universe.

[2] At the SF Site, Steven H Silver observed that the book's parodying of action films is "masterful", and commended Pratchett for how "fresh" the humor was—while conceding that "reader(s) may not laugh out loud ... but there will be plenty of internal chuckling".

[4] During a 2011 interview,[5] Pratchett discussed his process for writing, and mentioned a self-invented goddess of writers called Narrativia, whom he believed to be smiling upon him throughout his career.

One example of Narrativia's intervention from Thief Of Time was the naming of a key character, Ronnie Soak, the forgotten fifth horseman of the apocalypse.