Barrenechea is a surname. Notable people with the surname include:
Agustín Barrenechea (born 1979), Argentine-born American football linebacker Alejandro Barrenechea (born 1976), Spanish gymnast Ana María Barrenechea (1913–2010), Argentine writer, linguist and literary critic Claudia Barrenechea (born 1977), Chilean biathlete Enzo Barrenechea (born 2001), Argentine professional footballer Julio Barrenechea (1910–1979), Chilean writer, politician and diplomat Miguel Barrenechea (born 1947), Mexican sports shooter Raúl Porras Barrenechea (1897–1960), Peruvian diplomat, historian and politician