Umashimaji no Mikoto is a deity in Japanese mythology, recorded in the Kojiki and Nihon Shoki as the son of Nigihayahi no Mikoto. He is venerated as the founding ancestor of the Mononobe clan, a powerful lineage historically associated with military affairs and the imperial court's armory. Because of this martial heritage, he is sometimes honored in contexts related to strength and victory, though such associations reflect tradition rather than doctrinal claims.