Percy Greg (1836, Bury St Edmunds, Suffolk - 24 December 1889, Chelsea), son of William Rathbone Greg, was an English writer. Percy Greg, like his father, wrote about politics, but his views were violently reactionary: his History of the United States to the Reconstruction of the Union (1887) can be said to be more of a polemic, rather than a history. His Across the Zodiac (1880) is an early science fiction novel, said to be the progenitor of the sword-and-planet genre.