Ryuji Sainei (載寧 龍二, Sainei Ryūji), born on October 8, 1981, in Higashihiroshima, Hiroshima, Japan) is a Japanese actor, best known for his role as Banban "Ban" Akaza/Deka Red in the 2004 Super Sentai series Tokusou Sentai Dekaranger.

He is currently a freelance actor but was affiliated with Horipro until December 31, 2014.

On April 1, 2015, he changed his name to "さいねい 龍二", the same reading.