Spain and Portugal 2018 was an official joint Iberian bid for the right to host the 2018 FIFA World Cup. The International Federation of Football Association (FIFA) invited its member associations to bid for either the 2018 or the 2022 final tournaments, or both. The Portuguese Football Federation (FPF) and the Royal Spanish Football Federation (RFEF) submitted together a bid for both editions, but with the focus on winning the privilege to host the 2018 finals. Due to the withdrawal of all non-European bids for the 2018 edition, the Spanish-Portuguese bid, and that of all other European bidding nations, were effectively considered ineligible for the 2022 campaign.

On December 2, 2010, after a vote of the FIFA Executive Committee at its headquarters in Zürich, the Iberian bid lost the 2018 hosting rights to Russia, in a two-round voting, collecting seven votes against Russian's thirteen in the final round.

Eighteen venues across sixteen cities in Spain made the final bid package as potential host venues for the tournament. In Portugal, only the two most populous cities - Lisbon (2 venues) and Porto - earned a place in the final bid package. In all likelihood, based on the assumption that FIFA allows twelve venues for the tournament, nine venues would be allocated to Spain and the remaining three would go to Portugal.

After losing the 2018 bid, Portugal and Spain went on to bid for the 2030 edition and was later unanimously awarded in a joint bid with Morocco giving Portugal to finally host it on their second attempt and giving Spain to host it for the second time, with centenary games to be held in the South American countries of Argentina, Paraguay and Uruguay.