1. John Gerard(e) (1545-1612) author of The Herball, or Generall Historie of Plants
2. John Gerard S.J. (1564-1637) Autobiography of a Hunted Priest
3. John Gerard (1840-1912) coincidentally also wrote on the subject of the Gunpowder Plot, but was clearly not the same person as the 17th century Jesuit.
4. John Gerard (1955 - ) A Quiet Grandeur
5. John Gerard, pulp writer, fl. 1920s-1930s