Alfonso Cabeza de Vaca y Leighton, 11th Marquess of Portago, GE (11 October 1928 – 12 May 1957), best known as Alfonso de Portago, was a Spanish aristocrat, racing and bobsleigh driver, jockey and pilot. Born in London to a prominent family in the peerage of Spain, he was named after his godfather, king Alfonso XIII. His grandfather, the 9th Marquess of Portago had been Mayor of Madrid while his father, who was President of Puerta de Hierro and a prolific golfer, died of a heart attack while showering after a polo match. His mother, Olga Leighton, was an Irish nurse.