Ormaechea is a Basque surname. Notable people with the surname include:
Agustín Ormaechea (born 1991), Uruguayan rugby union player, son of Diego David Ormaechea (1887–?), Spanish lawyer and sports leader 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