Other
- Isadore Nabi, pseudonym used by a group of scientists including Richard Lewontin, Richard Levins, Robert MacArthur, and Leigh van Valen in the 1960s.
- San Isidro (disambiguation), Spanish for "Saint Isidore", and the name of several people and places
- Jack Isidore, a fictional character in Philip K. Dick's novel Confessions of a Crap Artist
- John R. Isidore, a fictional character in Philip K. Dick's novel Do Androids Dream of Electric Sheep?
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