Victoriano Gregorio de Ysasi Jáuregui was a Spanish wine merchant and philatelist resident in London. He was an early member of the Philatelic Society, London, later the Royal Philatelic Society London. Shortly before his death, major parts of his collection of the stamps of Spain and its colonies were acquired by Thomas Tapling. He died from injuries received in a railway accident at Blackburn while waiting in a carriage at a railway station when a connecting train failed to stop in time.