from Wikipedia:
Ryū (竜 or 隆 or りゅう or リュウ, Ryū) listen (help·info)
Ryū (school), a school of thought or discipline (for example a fighting school).Dragon: the Old Potter's Tale
(龍, Ryū), a book by Ryūnosuke AkutagawaRyū (manga), a series by Masao Yajima and Akira OzeRyu (Korean name), a common Korean family nameMonthly Comic Ryū, a manga magazine in JapanRyū, the Japanese word for a Japanese dragon
People
Ryu Fujisaki, a manga artist
Fictional characters
Ryu Hayabusa, the protagonist in the Ninja Gaiden series.Ryu (Street Fighter), a leading character in the Street Fighter video game series.Ryu Jose, a character from Mobile Suit Gundam.Ryu Kumon, a minor character in Ranma 1/2."Wooden Sword" Ryu, a Shaman King character.Ryū, Raoh's son from Fist of the North Star.Ryu (Breath of Fire), the protagonist in the Breath of Fire seriesRyuuwon, creator of the Jaryuu in GoGo Sentai Boukenger