Ondarroa is a town and municipality located in the province of Biscay, in the autonomous community of the Basque Autonomous Community, northern Spain.

• Church of St. Mary, in late Gothic style (late 15th century)
• Likona Tower, a typical Basque tower-house.
• Itsas Aurre Bridge, designed by Santiago Calatrava

• 
  Likona Tower
• 
  Church of St. Mary
• 
  Old Bridge
• 
  Itsas Aurre Bridge

• Pedro Maria Unanue (1814-1846)
• Txomin Agirre (1864-1920)
• Agustin Zubikarai (1914-2004)
• Karmele Urresti Iturrioz (1916-2010)
• Dina Bilbao (1960-1997) - athlete
• Ana Urkiza (b. 1969) - writer
• Kirmen Uribe (b. 1970) - writer
• Kepa Arrizabalaga (b. 1994) - goalkeeper for Real Madrid On loan from Chelsea football club and Spain, previously of Athletic Bilbao

• Santa Flavia, Italy
• Borj, Western Sahara

• ONDARROA in the Bernardo Estornés Lasa - Auñamendi Encyclopedia (Euskomedia Fundazioa) (in Spanish)
• Ondarroa Town Hall (in Spanish and Basque)