Heondeok (died 826) (; r. 809–826) was the 41st to rule the Korean kingdom of Silla. He was the younger brother of King Soseong, and served as regent during the reign of Aejang.

In 790, Heondeok traveled to Tang China where he distinguished himself and received a high position. He returned to Silla, becoming regent after the death of his brother. In 809, he slew the now-adult Aejang and took the throne for himself.

In 810, Heondeok repaired the country's irrigation facilities. He also sent his son Kim Hŏnjang to Tang with gold and silver Buddhist images to pray for the emperor's eternal peace.

Heondeok's later reign saw the rebellion of Kim Hŏnch'ang in 822, and that of Kim Hŏnch'ang's son in the following year. Both were suppressed. In 824, troubled by threats from the north, the king ordered a 300-ri-long wall built near the Taedong River, which was then the country's northern border.

He is believed to be buried in the Tomb of King Heondeok in Gyeongju, South Korea.

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宪德王金彦升（？ - 826年）是新罗第四十一代君主，昭圣王母弟。哀庄王十三岁即位时，叔父宪德王摄政，哀庄王十年，宪德王与其弟金悌邕入内作乱，哀庄王被弑，宪德王自立为王。十四年以母弟金秀升为太子。在位十八年，諡宪德，葬于泉林寺北（今东泉府东五里）。

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