Jia, King of Wei (, died 225 BC?) was the last ruler of the state of Wei during the waning days of the Warring States Period of Chinese history. He ruled the kingdom between 227 BC and 225 BC.

Jia was the son of King Jingmin of Wei. He ascended the throne after his father's death. In 225 BC, a Qin army led by Wang Ben invaded Wei. Wen Ben directed the waters from the Yellow River and the Hong Canal to inundate the capital of Wei, Daliang (present-day Kaifeng). Three months later, the city wall was destroyed, Jia had to surrender. His fate was not mentioned in the Records of the Grand Historian; however, according to Biographies of Exemplary Women and Zizhi Tongjian, he was executed by Qin army.

魏王假（？ - 前225年?），原名魏假，魏景湣王魏增之子。魏王假三年（前225年），秦將王賁引黃河、鴻溝水灌大樑城，水淹三月，城內死傷無數，魏假投降，魏國滅亡，凡八傳，歷九君。

《資治通鑑》記錄魏假投降後遭處死。但在《史記》中並未記載魏假投降後的下落。

魏假之弟魏咎，在秦末民變中崛起，自立為王。魏咎死後，弟魏豹又繼之，被項羽封為西魏王。

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