Liu Yu's Northern Expeditions (simplified Chinese: 刘裕北伐; traditional Chinese: 劉裕北伐; pinyin: Liú Yù Běi Fá) were a series of successful campaigns mounted by the Eastern Jin dynasty from 409 AD to 416 AD against the Southern Yan, Later Qin, Northern Wei and Hu Xia dynasties that successfully recovered all of Eastern Jin's territory south of the Yellow River with the exception of the Chang'an area, which was taken by Hu Xia.

Following the Eastern Jin's victory at the Battle of Fei River, North China divided into several dynastic states ruled by non-Han peoples.

When he reached the area, Liu Yu saw that the ground was covered with grain and he said to his men that: "The Southern Yan ruler is already in my hand", as there would be no supply problems.

Following this victory, it seemed that the Eastern Jin would quickly destroy Hu Xia, Northern Wei and the remaining non-Han states, reunifying China proper.

As a result, Xia conquered Guanzhong while many of Liu Yu's key generals like Wang Zhen'e and Zhu Lingshi were killed.

These victories laid the foundation for the Reign of Yuanjia, a period of relative prosperity brought about by diminished threats of invasion or constant warfare.