Rupert of Hentzau is a sequel by Anthony Hope to The Prisoner of Zenda, written in 1895[contradictory] but not published in book form until 1898.

This story commences three years after the conclusion of Zenda, and deals with the same fictional country somewhere in Germanic Middle Europe, the kingdom of Ruritania.

Most of the same characters recur: Rudolf Elphberg, the dissolute absolute monarch of Ruritania; Rudolf Rassendyll, the English gentleman who had acted as his political decoy, being his distant cousin and look-alike; Flavia, the princess, now queen; Rupert of Hentzau, the dashing well-born villain; Fritz von Tarlenheim, the loyal courtier; Colonel Sapt, the King's bodyguard; Lieutenant von Bernenstein, a loyal soldier.

Rassendyll returns to Ruritania to aid the Queen, but is once more forced to impersonate the King after Rupert fatally shoots Rudolf V in a remote hunting lodge.

After a successful year on tour, a theatrical adaptation of Rupert of Hentzau opened at the Lyceum Theatre in New York City on April 10, 1899.