魏襄王（? - 前296年），姬姓，魏氏，名嗣，魏惠王之子。魏襄王元年（前318年），魏、韓、趙、楚、燕五國合縱攻秦，不克而返。惠施為魏出使楚國。前296年魏襄王薨，子昭王立。

西晉太康二年（279年），汲郡人不准掘發魏襄王墓（或言安釐王塚），得竹書數十車。這些竹書包括了魏襄王時期魏國人撰寫的史書《竹書紀年》以及《穆天子傳》、《瑣語》等書，《竹書紀年》較西漢司馬遷的《史記》更準確。

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King Xiang of Wei (魏襄王; died 296 BC), personal name Wei Si (魏嗣), was king of the Wei state from 318 BC to 296 BC. He was the son of King Hui. In 318 BC, at the suggestion of the Wei minister Gongsun Yan, he entered into an alliance against the Qin state created by King Huai of Chu which also included the states of Zhao, Han and Yan. Chu then betrayed this alliance.

In 317 BC, at the suggestion of chancellor Zhang Yi, King Xiang entered into an alliance with Qin. To punish Chu for its betrayal of the five-state alliance, King Xiang sent an army in 312 BC to attack the city of Dengcheng in Chu (modern-day Shangshui County, Zhoukou, Henan Province).

Wei itself was attacked by the Qi state in 310 BC, and King Xiang met King Wu of Qin at Linjin (modern-day Linyi County, Yuncheng, Shanxi Province). In 308 BC, the two kings met again at Yingcheng (modern-day part of Xiaogan, Hubei) to plan an attack on Han.

In 306 BC, after the death of King Wu of Qin, Wei's alliance with Qin broke down, and Qin invaded, attacking and occupying the city of Puban. Qin chancellor Gan Mao defected to Wei and the invading forces were withdrawn. In 303 BC, Qin took advantage of Wei's alliance with Qi and Han against Chu to launch a second invasion.

In 302 BC, relations between Wei and Qin normalized, and King Xiang met King Zhaoxiang of Qin and Han Ying (crown prince of Han) at Linjin, in which Qin agreed to return Puban. This allowed alliance of Wei, Han and Qi in inflict a major defeat on Chu in 301 BC. In 299 BC, King Xiang met with King Min of Qi and King Wuling of Zhao at Han's capital Xinzheng to propose a four-state alliance of Qi, Han, Wei and Zhao against Qin.

It was in King Xiang's tomb that the Bamboo Annals were discovered in AD 279, an event referred to as the Jizhong discovery.