Buendía or Buendia means "good day" in Spanish and may refer to the following people:

• Ángel Buendía Tirado (born 1951), Mexican economist and politician
• Ely Buendia (born 1970), Filipino writer and musician
• Emi Buendía (born 1996), Argentine footballer
• General Juan Buendía, Peruvian military leader at the Battle of San Francisco
• Jeremy Buendia (born 1990), American professional bodybuilder
• Juan Buendía (1816–1895), Peruvian military man
• Manuel Buendía (1926–1984), Mexican political columnist
• Miguel Maury Buendía (born 1955), Spanish prelate of the Catholic Church
• Nicolas Buendia (1879–1958), Filipino politician
• Pablo Buendía (born 1986), Spanish football defender
• Ruth Buendía (born 1977), Peruvian indigenous activist
• Ryan Buendia (born c. 1982), American recording artist, DJ, producer, and songwriter
• Silvia Buendía (born 1967), Ecuadorian lawyer, TV host, columnist, and feminist activist
• Soledad Buendía, Ecuadorian politician