Stanley John Weyman (pronounced [waɪ mæn], 7 August 1855 – 10 April 1928) was an English writer of historical romance.

His short story "King Pippin and Sweet Clive" appeared in the Cornhill Magazine, although its editor, James Payn, himself a novelist, told Weyman it would be easier to make a living writing novels.

Weyman viewed himself as a historian and so he was particularly encouraged by positive notices for an article he wrote on Oliver Cromwell that was published in the English Historical Review.

In a 1970 BBC interview, Graham Greene said, "The key books in my life included Anthony Hope, Rider Haggard, Captain Gilson and I do occasionally re-read them.

The biographer Reginald Pound grouped Weyman with Arnold Bennett, Anthony Hope, Aldous Huxley, Dorothy L. Sayers and Somerset Maugham as Strand writers.

With odd exceptions such as Gil de Berault in Under the Red Robe, his characters are fairly uniform, his women caricatures, and his dialogue wooden to modern ears.

The Long Night is based on the Duke of Savoy's attempt to storm Geneva in December 1602, an event still celebrated annually in a festival called L'Escalade.