- In The Sandman, Dream's castle includes a library of books that were thought of but never actually written, including G.K. Chesterton's The Man Who Was October.
- In Camera Obscura, an Eighth Doctor Adventures novel, recurring antagonist Sabbath uses "G.K. Thursday" as an alias.
- The Man Who Was Saturday, a 1985 spy thriller by Derek Lambert, uses the title snowclone and not much else, although it does have an author's note in the front saying, "With apologies to the memory of G.K. Chesterton, whose man was Thursday."
- The Man Who Was Saturday, a 2019 biography by Patrick Bishop of real-life spymaster Airey Neave.
- In Moth and Cobweb, one of the characters borrowed from other works is the Man in the Dark Room.
- In Welkin Weasels, Spindrick's anarchist group use weekdays as code names.
- Deus Ex:
- Gabriel Syme's name appears in the guest book of Hilton Hotel.
- One of the books scattered as interactive props around the game turns out if you pick it up and read it to be The Man Who Was Thursday.
- In Fallen London, the anarchist revolutionaries are led by a Calendar Council whose members use the names of months as code names.