Ryūjin is the deity of the sea in Japanese mythology.
Ryūjin or Ryujin may also refer to:
Places Ryūjin, Wakayama, a small village that was merged into the city of Tanabe, Japan in 2005 Mount Ryūjin, the highest point in Wakayama Prefecture, Japan
Entertainment Ryujin (rapper) (born 2001), South Korean rapper, member of girl group Itzy Ryu Jin (born 1972), South Korean actor Ryujin (band), a Japanese metal band formerly known as Gyze