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 academicRyūichi Amano (天野 龍一) (1902–1995), Japanese photographerRyuichi Dogaki (堂柿 龍一) (born 1988), Japanese footballerRyuichi Doi (土肥 隆一) (born 1939), Japanese politicianRyuichi Hirashige (平繁 龍一) (born 1988), Japanese footballerRyūichi Hiroki (廣木 隆一) (born 1954), Japanese film director and editorRyuichi Kaji (嘉治 隆一) (1896–1978), Japanese journalistRyuichi Kajimae (加治前 竜一) (born 1985), Japanese baseball playerRyuichi Kamiyama (神山 竜一) (born 1984), Japanese footballerRyuichi Kawamura (河村 隆一) (born 1970), Japanese singer-songwriter, actor and record producerRyuichi Kihara (木原 龍一) (born 1992), Japanese figure skaterRyuichi Kiyonari (清成 龍一) (born 1982), Japanese motorcycle racerRyuichi Kobayashi (小林 竜一) (born 1976), Japanese bobsledderKuki Ryūichi (九鬼 隆一) (1852–1931), Japanese samuraiRyuichi Moriya (守屋 龍一) (born 1985), Japanese archerRyuichi Murata (村田 龍一) (born 1976), Japanese judoka and mixed martial artistRyuichi Obitani (帯谷 竜一) (1908–?), Japanese figure skaterRyuichi Oda (小田 龍一) (born 1976), Japanese golferRyuichi Ogata (緒方 龍一) (born 1985), Japanese singer and musicianRyuichi Sakamoto (坂本 龍一) (born 1952), Japanese musician and composerRyuichi Sugiyama (杉山 隆一) (born 1941), Japanese footballer and managerRyūichi Tamura (田村 隆一) (1923–1998), Japanese poet, writer and translator