圣洛（法语：Saint-Lô）位于法国下诺曼底大区，是芒什省的首府。

早于古时，高卢人就在圣洛兴建炮台作防卫用。中世纪曾被查理大帝征服。1202年成为法国领土一部分。百年战争期间曾受战火波及。

法国大革命后，1795年成为芒什省的省会。

Saint-Lô (French pronunciation: ​[sɛ̃lo]) is a commune in north-western France, the capital of the Manche department in the region of Normandy.

Although it is the second largest city of Manche after Cherbourg, it remains the prefecture of the department. It is also chef-lieu of an arrondissement and two cantons (Saint-Lô-1 and Saint-Lô-2).