Ormaechea is a Basque surname. Notable people with the surname include:
- Agustín Ormaechea (born 1991), Uruguayan rugby union player, son of Diego
- Diego Ormaechea (born 1959), former Uruguayan rugby union player, father of Agustín
- Francisco de Lersundi y Ormaechea (1817 – 1874 ), Spanish noble and politician
- José Eulogio Gárate Ormaechea (born 1944), former Spanish footballer
- Paula Ormaechea (born 1992), Argentine tennis player
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