洛萨尔科斯（西班牙语：Los Arcos），是西班牙纳瓦拉的一个市镇。总面积58平方公里，总人口1286人（2001年），人口密度22人/平方公里。

Los Arcos is a town and Spanish municipality, in the Chartered Community of Navarre, situated in the administrative division of Estella, in the region of East Estella and is 62km from the capital of the community, Pamplona. Its population in 2013 was 1182 inhabitants (INE).