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Ugarte or uharte is a Basque word meaning "island". It can also be spelt Huarte Hugarte, or Duarte in Spanish, and Uhart Duhart or Duharte in French. Notable people with the surname include:
- Adriana Ugarte (born 1985), Spanish actress
- Agustín Jerónimo de Iturbide y Huarte (1807–1866), Prince Imperial of Mexico
- Alfonso Ugarte (1847–1880), Peruvian military commander
- Alfredo Ugarte, Chilean hurdler
- Alirio Ugarte Pelayo (1923–1966), Venezuelan politician
- Ana Carolina Ugarte (born 1992), Venezuelan model and beauty pageant titleholder
- Andoni Ugarte (born 1995), Spanish footballer
- Augusto José Ramón Pinochet Ugarte (1915–2006), Chilean military officer and dictator
- Francisco Ugarte (footballer, born 1959), Chilean footballer
- Francisco Ugarte (footballer, born 1986), German-Chilean footballer
- Gloria Ugarte, Argentinian actress
- Jose de la Torre Ugarte (1798–1878), Peruvian lyricist
- José Humberto Ugarte (born 1980), Costa Rican footballer
- José Luis Ugarte (1928–2008), Spanish sailor
- John Huarte (born 1944), American football quarterback
- Juan de Ugarte (1662–1730), Jesuit missionary and explorer
- Juan Huarte de San Juan (c. 1530–1592), Spanish physician and psychologist
- Juan Ugarte (born 1982), Spanish footballer
- Juan Vicente Ugarte del Pino (1923–2015), Peruvian historian and jurist
- Julio Ugarte y Ugarte (1890–1949), Peruvian writer
- Manuel Ugarte (footballer) (born 2001), Uruguayan footballer
- Manuel Ugarte (writer) (1875–1951), Argentinian author
- Manuel Ugarte Soto (born 1940), Chilean police officer and lawyer
- Marcelino Ugarte (1855–1929), Argentinian jurist and politician
- María Dolores Ugarte, Spanish statistician
- María Ugarte (1914–2011), Spanish-Dominican journalist and writer
- Nicolás Armentia Ugarte (1845–1909), Spanish missionary and bishop
- Óscar Ugarte (born 1944), Peruvian physician and politician
- Paula Ugarte (born 1987), Argentinian footballer
- Pedro Ugarte (born 1963), Spanish writer and columnist
- Poly Ugarte (born 1959), Ecuadorian activist, lawyer, and politician
- Renzo Pi Hugarte (1934–2012), Uruguayan anthropologist
- Salvador de Iturbide y Huarte (1820–1856), prince of Mexico
- Sebastian Ugarte, Filipino footballer and sports executive
- Víctor Ugarte (1926–1995), Bolivian footballer
- Xóchitl Ugarte (born 1979), Mexican voice actress
- Zoila Ugarte de Landívar (1864–1969), Ecuadorian writer and suffragist