Ryūichi, Ryuichi or Ryuuichi (written: 隆一, 龍一 or 竜一) is a masculine Japanese given name. Notable people with the name include:
Ryuichi Abe (阿部 龍一), Japanese academic
Ryūichi Amano (天野 龍一) (1902–1995), Japanese photographer
Ryuichi Dogaki (堂柿 龍一) (born 1988), Japanese footballer
Ryuichi Doi (土肥 隆一) (born 1939), Japanese politician
Ryuichi Hirashige (平繁 龍一) (born 1988), Japanese footballer
Ryūichi Hiroki (廣木 隆一) (born 1954), Japanese film director and editor
Ryuichi Kaji (嘉治 隆一) (1896–1978), Japanese journalist
Ryuichi Kajimae (加治前 竜一) (born 1985), Japanese baseball player
Ryuichi Kamiyama (神山 竜一) (born 1984), Japanese footballer
Ryuichi Kawamura (河村 隆一) (born 1970), Japanese singer-songwriter, actor and record producer
Ryuichi Kihara (木原 龍一) (born 1992), Japanese figure skater
Ryuichi Kiyonari (清成 龍一) (born 1982), Japanese motorcycle racer
Ryuichi Kobayashi (小林 竜一) (born 1976), Japanese bobsledder
Kuki Ryūichi (九鬼 隆一) (1852–1931), Japanese samurai
Ryuichi Moriya (守屋 龍一) (born 1985), Japanese archer
Ryuichi Murata (村田 龍一) (born 1976), Japanese judoka and mixed martial artist
Ryuichi Obitani (帯谷 竜一) (1908–?), Japanese figure skater
Ryuichi Oda (小田 龍一) (born 1976), Japanese golfer
Ryuichi Ogata (緒方 龍一) (born 1985), Japanese singer and musician
Ryuichi Sakamoto (坂本 龍一) (born 1952), Japanese musician and composer
Ryuichi Sugiyama (杉山 隆一) (born 1941), Japanese footballer and manager
Ryūichi Tamura (田村 隆一) (1923–1998), Japanese poet, writer and translator
