Soseong of Silla (died 800) (r. 798–800) was the 39th to rule the Korean kingdom of Silla. He was the grandson of King Wonseong, his father Kim In-gyeom having died before he could take the throne. He married Lady Gyehwa, the daughter of the daeachan Suk-myeong.

Soseong died only nineteen months after taking the throne. This brought on a renewal of the succession strife which typified later Unified Silla.

Soseong of Silla, who was raised in the royal court before he ascended the throne, was given a royal rite in 789, and went to the Tang dynasty in 790. He was appointed to the Si-jung in October 791, but retired due to illness in August the following year. When Uncle Uiyoung died early in 794, he was proclaimed Crown Prince in the year 795.

昭聖王或昭成王（？ - 800年）；姓金名俊邕，是新羅第三十九代君主，元聖王孫，惠忠太子仁謙之子，母聖穆王后金氏。在位二年，太子淸明即位為哀莊王，叔父金彥昇攝政。

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