The Sistema Ibérico or Iberian System is one of the main systems of mountain ranges in Spain. It is a vast and complex system of mountain chains and massifs located in the central regions of the Iberian Peninsula, but reaching almost the Mediterranean coast in the Land of Valencia in the east.

From the hydrographic viewpoint this system is of the highest importance in the Iberian Peninsula, for it contains the watershed between the Ebro basin and the basins of the rivers Duero, Tajo, Guadiana (Záncara-Gigüela), Júcar and Turia (as Guadalaviar), among others.

The Sistema Ibérico mountain range borders the Meseta Central on its western end and separates the Meseta Central from the Ebro valley and from the Mediterranean coast.

This system runs northwest-southeast between the Ebro plain and the Meseta Central for over 500 km, from the La Bureba corridor in Burgos Province close to the Cordillera Cantábrica to the Mediterranean sea close to Valencia in the south and close to Tortosa and the Ebro delta in the east. The bulk of the Sistema Ibérico is located in the southern half of Aragon. The Prebaetic System rises south of the southernmost end of the Iberian System.