Gaijiro Fujishima (藤島亥治郎, Fujishima Gaijirō) (1 May 1899 – 15 July 2002), was a Japanese architectural historian.
His son, Yukihiko Fujishima, is a lecturer at Waseda University.
He was born in Morioka, Iwate Prefecture, in 1899.
He designed the Kurihara Ruins in Tokyo in 1957.
He retired in 1960, and became Professor Emeritus of the University of Tokyo.