The festival of San Fermin (or Sanfermines) in the city of Pamplona (Navarre, Spain), is a deeply rooted celebration held annually from 12:00 noon on July 6th, when the opening of the fiesta is marked by setting off the pyrotechnic chupinazo, to midnight of July 14th, with the singing of the Pobre de Mi.

While its most famous event is the encierro, the running of the bulls, the biggest day is July 7th, when thousands of people accompany a replica of the statue of Saint Fermin along the streets in the old part of Pamplona. San Fermin is accompanied by dancers and street entertainers, such as the Gigantes (giant-sized figures who represent the King and Queen of Europe, Asia, Africa, and America) and the Cabezudos (the Bigheads).

The week-long celebration involves many other traditional and folkloric events. It is known locally as Sanfermines and is held in honor of Saint Fermin, the co-patron of Navarra. Its events were central to the plot of The Sun Also Rises, by Ernest Hemingway, which brought it to the general attention of English-speaking people.

It has become probably the most internationally renowned fiesta in Spain. Over 1,000,000 people come to watch this festival.