Ryuzo Torii (?? ??; May 4, 1870 – January 14, 1953) was a Japanese anthropologist, ethnologist, archaeologist and folklorist.
He was known for his anthropological research in China, Taiwan, Korea, Russia, Europe, etc.
His research took him all over East Asia and South America.
Torii first made use of a camera while conducting field-work in Northeastern China in 1895.
In 1900, Torii was assisted in his research by interpreter Ushinosuke Mori.
Described as "a pioneer in the use of the camera in anthropological field-work", Torii inspired other researchers, including Mori, to make use of photographs.