Formosa is a placename which comes from the Portuguese word meaning beautiful. Formosa is also a surname found in the Maltese Islands:

• The non-native name for the island of Taiwan, or for the Republic of China
• Formosa Strait (Taiwan Strait)
• Formosa Province, Argentina
• Formosa, Argentina, the capital of its namesake province
• Formosa, Brazil , near Brasília in Goiás State
• Formosa, Virginia , USA
• Formosa, Arkansas , USA
• Formosa, Santarém, Portugal
• Formosa, Portalegre, Portugal
• The name given to Bioko island by Fernando Poo

Formosa may also refer to a fictional country located on the island of Taiwan, but whose culture was invented by George Psalmanazar as a hoax.

See also: Formosa Magazine, Republic of Formosa