Ziying (子嬰 zi5 ying1) ( ? - end of January 206 BC) was the last ruler of the Qin Dynasty of China, ruling as King of Qin (秦王) from mid-October to the beginning of December 207 BC.

He was the son of Fusu, who was the eldest son of the First Emperor of Qin. After he succeed as the ruler of Qin, he killed the powerful Chief Eunuch Zhao Gao. He then surrendered to Liu Bang -- the first rebel leader to enter the capital Xianyang and the later founder of Han Dynasty. He was only on the throne for 46 days. He was soon killed after Liu Bang handed him over to the most powerful rebel of the time, Xiang Yu.

The Shiji does not specify his age. It implies that he has at least two sons, however, when it says that Ziying consulted with them.