Duke Cheng of Qi

{{infobox royalty

|name = Duke Cheng of Qi
齊成公

|succession = Duke of Qi

|reign = 803–795 BC

|predecessor = Duke Wen

|successor = Duke Zhuang I

|full name = Ancestral name: Jiāng (姜)
Clan name: Lǚ (呂)
Given name: Yuè (說) or Tuō (脫)

|house = Jiang

|dynasty = Jiang Qi

|death_date = 795 BC

| posthumous name = Duke Cheng (成公)

| father = Duke Wen

| issue = Duke Zhuang I

}}

Duke Cheng of Qi ({{zh|c=齊成公|p=Qí Chéng Gōng}}), personal name Lü Yue or Lü Tuo, was duke of the Qi state from 803 BC to 795 BC.{{cite web |url=http://www.guoxue.com/shibu/24shi/shiji/sj_032.htm |script-title=zh:齐太公世家 |trans-title=House of Duke Tai of Qi |work=Records of the Grand Historian |author=Sima Qian |author-link=Sima Qian |language=Chinese |publisher=Guoxue.com |accessdate=14 May 2012}}{{cite book |title=Shiji (史记) |editor=Han Zhaoqi (韩兆琦) |year=2010 |publisher=Zhonghua Book Company |location=Beijing |isbn=978-7-101-07272-3 |language=Chinese |pages=2513–2514}}

Duke Cheng succeeded his father, Duke Wen, as ruler of Qi. He reigned for 9 years and died in 795 BC. He was succeeded by his son, Duke Zhuang I.