Liu Yu may refer to:
- Liu Yu (prince) (劉餘; died 128 BC), Western Han Dynasty prince, son of Emperor Jing
- Liu Yu (Ziqi) (劉瑜), style name Ziqi (子奇), Eastern Han Dynasty official
- Liu Yu (warlord) (劉虞; died 193), Eastern Han Dynasty noble and warlord
- Emperor Wu of Liu Song (363-422), name Liu Yu (劉裕), founder of the Liu Song Dynasty
- Emperor Ming of Liu Song (439-472), name Liu Yu (劉彧), Liu Song emperor
- Emperor Houfei of Liu Song (463-477), name Liu Yu (劉昱), Liu Song emperor
- Yu Liu, a historian, professor and 2006 Guggenheim Fellow
- Liu Yu (swimmer) (born 1982), swimmer
- Liu Yu (footballer) (刘宇; born 1985), footballer