Determining the absolute biggest football rivalry in the world is a subject of intense debate among global fans, as several fixtures command staggering international attention due to deep political, cultural, and historical animosities. Prominent global contenders include El Clásico between Real Madrid and Barcelona in Spain, the Superclásico between Boca Juniors and River Plate in Argentina, the Old Firm derby between Celtic and Rangers in Scotland, and the Intercontinental Derby between Galatasaray and Fenerbahçe in Turkey, each defining the ultimate expression of tribal football passion.