While grown-ups dressed in red costumes with wispy white beards, children donned green elf outfits to run the 5.5 kilometre (3.4 miles) course through the city centre.
The race was organised today by one of Spain's leading department stores and it contributed 1 euro (USD 1.34) for each entrant to a charity that buys Christmas presents for deprived children around the world.
Javier Menendez, one of the runners, said he was surprised at the number of people who have donned the robes for the run.