Circumnavigation is the complete navigation around an entire island, continent, or astronomical body. This article focuses on the circumnavigation of Earth.

Ruy López de Villalobos was a Spanish explorer who led a failed attempt to colonize the Philippines in 1544, attempting to assert Spanish control there under the terms of the treaties of Tordesillas and Zaragoza. Unable to feed his men through barter, raiding, or farming and unable to request resupply from Mexico due to poor knowledge of the Pacific's winds and currents, Villalobos abandoned his mission and fled to the Portuguese-held Moluccas, where he died in prison. He is chiefly remembered for some sources crediting him with naming Leyte the "Philippine Island" in honor of the Spanish crown prince Philip. The name was later extended across the entire Philippine Archipelago and its nation.