| Emperor Ruizong of Northern Han | |
| Succession: | 2nd Emperor of Northern Han |
| Reign: | 954–968 |
| Predecessor: | Liu Chong |
| Successor: | Liu Ji'en |
| Temple Name: | Ruizong (睿宗) |
| Birth Name: | Liu Chengjun (劉承鈞) |
| Birth Date: | 926 |
| Death Date: | 968 |
| Era Dates: | Qianyou (乾祐):[1] 954–956 Tianhui (天會): 957–968 |
| Full Name: | Family name Liu (劉) |
| Father: | Liu Chong |
| Posthumous Name: | Emperor Xiaohe (孝和皇帝) |
| House: | Liu |
| Dynasty: | Northern Han |
Liu Jun (926–968), originally Liu Chengjun, also known by his temple name as the Emperor Ruizong of Northern Han (北漢睿宗), was the second emperor of the Shatuo-led Northern Han dynasty of China. His capital was at Taiyuan, Shanxi Province. He was the second son of the Northern Han founder Liu Chong (Emperor Shizu). In 951, after the death of his brother Liu Yun, he became the heir of his father.