Duke Ai of Han

Marquess Ai of Han (; died 374 BC), personal name unknown, was marquess of the Han state from 376 BC until his death in 374 BC. He was the son of his predecessor, Marquess Wen.

In 376 BC, Han, Wei, and Zhao deposed Duke Jing of Jin. They then divided his land, marking the collapse of the Jin state.

The following year, after two unsuccessful invasions, Han annexed the Zheng state. It then moved the capital to Xinzheng (in present-day Henan). At this time, its territory contains south-eastern part of Shanxi and central part of Henan.

According to Zizhi Tongjian, while Marquess Ai appointed Han Xialei (韓俠累) to be prime minister, he had closer relations with Yan Sui (嚴遂). They were archenemies of each other. In 374 BC, Yan Sui plotted to assassinate Han Xialei at the court. Han Xialei sought help from Marquess Ai, who then hugged him. As a result, both were killed by the assassin. However, the Records of the Grand Historian tells a different story: Marquess Ai was murdered by Han Xialei and Yan Sui, and it was not an accident.

The Han throne then passed to Marquess Gong, son of Marquess Ai. Marquess Gong later moved the capital back to Yangzhai.