Onorato Caetani, XIV Duke of Sermoneta and IV Prince of Teano (18 January 1842 – 2 September 1917) was an Italian politician from the noble Caetani-family.
He was born in Rome, which was then part of the Papal States, to Michelangelo and Calixta Rzewuska.
He graduated in law at the University of Rome in 1863 and lived for a long time in England.