Ryūzōji Iekazu served as a bushō during the Sengoku period.  He was the fifteenth head of the Ryūzōji clan of Hizen Province.

Iekazu was born as the second son of Ryūzōji Yasuie, the fourteenth head of the Ryūzōji clan who were kokujin, or provincial landowners, in Hizen.

His eldest brother, Ryūzōji Taneie, caused a conflict within the family and absconded so Iekazu inherited the headship and became the fifteenth head of the clan.

In 1507, after Ōuchi Yoshitaka summoned assorted daimyō from Chūgoku, Shikoku, and Kyūshū and commenced a march upon Kyōto, Iekazu participated as a member of the Ōuchi army.  Thereafter, while obeying to the Kyūshū-Chiba and Ōuchi clans, he maintained his power in Hizen.

In 1528, Iekazu died and was succeeded by his lineal heir, Ryūzōji Tanekazu.