Ilseong of Silla (died 154, r. 134–154) was the seventh ruler of Silla, one of the Three Kingdoms of Korea. He is commonly called Ilseong Isageum (Hangul:일성 이사금, Hanja: 逸聖尼師今), isageum being the royal title in early Silla. As a descendant of Silla's founder Hyeokgeose, his surname was Bak.