玛尔斯（拉丁语：Mars），罗马神话中的战神，朱比特与茱诺之子，贝娄娜之丈夫，维纳斯的情人，他是罗马军团崇拜的战神中最重要的一位，重要程度仅次于朱比特。玛尔斯的节日是在三月和十月。拉丁语的「火星」和英语的「March」正是源自玛尔斯。但拉丁语「Mars」一词并非源自原始印欧语，似乎是从伊特拉斯坎神话中的玛里斯（Maris）拉丁化而成的。起初玛尔斯是罗马神话中的繁殖与植物之神，同时亦是牲畜、农田与农夫的守护神。在公元前2世纪，大加图曾说「好好饲养你的牲畜，每年要向玛尔斯·西尔瓦诺斯（Mars Silvanus）奉献。」后来，随着罗马帝国的扩张，玛尔斯成为了战争的象征，等同希腊神话中的阿瑞斯。但与阿瑞斯不同，玛尔斯一般备受敬畏，跟朱庇特一样是最受尊崇的神祇。

In ancient Roman religion and myth, Mars (Latin:Mārs, [maːrs]) was the god of war and also an agricultural guardian, a combination characteristic of early Rome. He was second in importance only to Jupiter and he was the most prominent of the military gods in the religion of the Roman army. Most of his festivals were held in March, the month named for him (Latin Martius), and in October, which began the season for military campaigning and ended the season for farming.