Pedro Fernandes de Queirós (1563–1614) was a Portuguese navigator in the service of Spain. He is best known for his involvement with Spanish voyages of discovery in the Pacific Ocean, in particular the 1595–1596 voyage of Álvaro de Mendaña y Neira, and for leading a 1605–1606 expedition that crossed the Pacific in search of Terra Australis.

Álvaro de Mendaña y Neira was a Spanish navigator, explorer, and cartographer, best known for two of the earliest recorded expeditions across the Pacific Ocean in 1567 and 1595. His voyages led to the discovery of the Marquesas, Cook Islands, and Solomons among other archipelagos. Born in Congosto, in El Bierzo Region (León), he was the nephew of Lope García de Castro, viceroy of Peru.