Ferdinand de Quir (also known as Pedro Fernandes de Queirós (or Spanish: Pedro Fernández de Quirós) (1565–1614)) was a Portuguese navigator in the service of Spain best known for his involvement with Spanish voyages of discovery in the Pacific Ocean, in particular the 1595–1596 voyage of Alvaro de Mendaña de Neira, and for leading a 1605–1606 expedition which crossed the Pacific in search of Terra Australis …
