Luu may refer to:
- Luu, a Vietnamese surname
- LUU, an initialism for the Leeds University Union, the representative body for the students at the University of Leeds, England
- Jane Luu, a Vietnamese American astronomer
- Luu Bu, an alternate spelling of Lü Bu, (156–198) a military general and minor warlord during the late Eastern Han Dynasty and Three Kingdoms period in ancient China
- Luu Dongbin, an alternate spelling of Lü Dongbin, a Chinese deity revered by Daoists
- Luu Vinh Phuc, an alternate spelling of Liu Yung-fu (1837-1917) the second and last President of the Republic of Formosa from June 5, 1895 to October 21, 1895
- Empress Luu, an alternate spelling of Empress Lü Zhi (d. 180 BC) the wife of Emperor Gao of the Han Dynasty in China
Lưu or Luu is a Vietnamese surname. It is also the Vietnamese transliteration of the Chinese surname Liu (劉). during the Ancient, The Yao people use surname Liu (劉), H'mong-Mien Lìu, they emigrate from Guangdong, Guangxi, to Vietnam. during the Yuan dynasty, the Mongols used the surname Liu in Vietnam.
In according to folk-story "Hùng Vương Ngọc Phả" (Family tree of Hung King) one of 50 son of Kinh Dương Vương there was Lưu Lang, who joined with Mother Âu Cơ and settled to northern mountain area of Van Lang. Luu Lang is considered as Ancestor of all Vietnamese/Kinh people possessed surname Luu. And other folktale: "Sự tích trầu cau" - Legend of areca nuts and betel leaves, its mentioned about a Landlord with surname Luu. The offering of areca nuts and betel leaves to the ancestors is a Vietnamese wedding ritual. It's also ancient legendary story only.
Lưu is a Vietnamese surname. Some (though not all) Lưu are of Han Chinese descent. Between changes in Chinese dynasties and regimes, there were several major Luu/Liu (劉) families who immigrated to Vietnam. An example would be the Shu Han 蜀漢 dynasty where Emperor Liu (Luu) Bei's 劉備descendants left their capital Chengdu in Sichuan. After losing the Cao Wei 曹魏dynasty in the Three Kingdoms 三國 era, many royalties and peasants alike headed south and eventually escaped to Vietnam. Another major immigration period is in 1949 when the communist took over China and many loyal nationalist of the Republic of China left to Vietnam. Prior to French occupation, Vietnamese writing was in Chinese characters and Luu was written as 劉. After French occupation, alphabets were introduced and Liu (劉) surnames were spelled as Luu. In 1919, the French government abandoned the use of Chinese characters and forced the Vietnamese to use strictly French's alphabet spelling system. Many Vietnamese at the time considered themselves as Chinese and refused to change. Many went to China to learn and maintain their Chinese heritage. One example would be Ho Chi Minh. Many descendants of Luu who speak Chinese would spell Luu in English and write 劉 as their Chinese surname. After the Vietnam War in 1975, many left the country and resettled all over the world. The majority resides in France and the United States.