Olaechea is a surname. Notable people with the surname include:
Jorge Olaechea (born 1956), Peruvian footballer Marcelino Olaechea (1889-1972), Spanish Roman Catholic bishop Max González Olaechea (1867–1946), Peruvian medical doctor, clinician, and university professor Pedro Olaechea (born 1954), Peruvian economist, vintner businessman, and politician