The final in East Rutherford, New Jersey, ended with Spain lifting the trophy after a 1‑0 victory over Argentina, a result that echoed their 2010 triumph.
Ferran Torres, introduced as a substitute, met a cross from Nico Williams with a decisive header in extra time, the ball slipping past Argentina's goalkeeper Emi Martinez.
A night of drama in New Jersey
Argentina's campaign was further complicated when Enzo Fernandez received a second yellow card, leaving his side a man short for the closing stages.
For Lionel Messi, the match marked the final chapter of his World Cup story, a bittersweet ending as the Argentine captain watched his team fall short of the title.
Spain also had a near‑miss earlier, when Lamine Yamal struck the post after a fine move, only to be denied by a spectacular save from Martinez.
The final whistle sparked an ugly melee involving several Argentine players, adding a volatile edge to an otherwise tightly contested affair.