Rui or RUI may refer to:

Names Rui (surname) (), a Chinese surname Rui (given name), a given name of independent Portuguese, Japanese, or Chinese origin

Places Rui (state) (), a Chinese state during the Zhou Dynasty Rui (village), a census town in Kolhapur district, Maharashtra, India. Royal University of Ireland

In fiction Rui, a character played by actor Luiz Fernando Guimarães in the popular Brazilian sitcom Os Normais and its spin-off films Rui (), a character in the Japanese anime/manga series Demon Slayer: Kimetsu no Yaiba Ruy Blas, a tragic drama by Victor Hugo Rui Kamishiro, a character in the Japanese video game series Project Sekai Rui Yoshii (), a minor character in the Japanese anime series Soaring Sky! Pretty Cure Hanazawa Rui, a character in the Japanese manga series Boys Over Flowers Ninomiya Rui, a character in the Japanese anime Gatchaman Crowds Yashio Rui, a character in the Japanese multimedia project BanG Dream!

Species Rui fish, a common name for Labeo rohita Rui tree, a common name for Calotropis gigantea

Other

Radio Ukraine International, is a Ukrainian national worldwide radio broadcasting service Released under investigation, a form of police bail in England Russell 1000 Index, stock market index with trading symbol ^RUI

See also Ruy (disambiguation)