Yong Ji or Lü Ji(呂己), personal name Zi Dian or Zi Zhou, was a Shang dynasty King of China.

In the Records of the Grand Historian he was listed by Sima Qian as the eighth Shang king, succeeding his brother Xiao Jia (小甲). He was enthroned in the year of Jiaxu (甲戌) with Bo (亳) as his capital. He ruled for 12 years, was given the posthumous name Yong Ji and was succeeded by brother Tai Wu (太戊).

Oracle bone script inscriptions on bones unearthed at Yinxu alternatively record that he was the eighth Shang king succeeding his brother Tai Wu (大戊), given the posthumous name Lü Ji (呂己) and succeeded by his nephew Zhong Ding (中丁). The economy began to decline under his rule.

雍己（？ - 前1476），子姓，名伷，是中國商朝的君王，前任君王太戊之弟，舊說小甲之弟，繼太戊之後為國君，然而據甲骨文周祭卜辭，太戊卻排在雍己之前，因此學者認為雍己應為太戊之弟。定都於亳。雍己在位時商朝逐漸衰落，諸侯不來朝。雍己死後，姪子中丁繼任。

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