Men at Arms is a fantasy novel by British writer Terry Pratchett, the 15th book in the Discworld series, first published in 1993. It is the second novel about the Ankh-Morpork City Watch on the Discworld. Lance-constable Angua von Überwald, later in the series promoted to the rank of Sergeant, is introduced in this book. Lance-constable Detritus is introduced as a new member of the watch as well, though he had already appeared in other Discworld novels, most notably in Moving Pictures. Also notable is the only appearance of Lance-constable Cuddy.

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.