Named after the French athlete who was killed in the First World War, the Jean Bouin annual 10k has been a fixture on the Barcelona sporting calendar since 1920 and is one of the oldest sporting events in Spain. The circuit begins near Pl. d'Espanya and takes athletes to the Parc de la Ciutadella via Paral.lel and the Ronda Litoral. From there, it's the Gran Va all the way back to the finishing line on Reina Maria Cristina just below the magic fountain on Montjuïc. You can sign up until November 19th.
This year there will also be a 5k race.
See here for more information and to sign up.