Tian Chang 田常 (d. 345) was a high minister of the state of Qi 齊 during the late Spring and Autumn period 春秋 (770-5th cent. BCE). His actual name was Gui Heng 嬀恆 or Chen Heng 陳恆, but in order to avoid the personal name of emperor Han Wen 漢文帝 (r. 180-157 BCE), Liu Heng 劉恆, he has been called Tian Chang instead of Tian Heng 田恆 from the Former Han period 前漢 (206 BCE-8 CE) on.
Together with Kan Zhi 闞止 (also called Jian Zhi 監止), he planned to grasp ever more power.
In 481, Tian Chang assassinated Kan Zhi and Duke Jian 齊簡公 (r. 484-482) and enthroned the duke's brother Prince Ao 驁, who is known as Duke Ping 齊平公 (r. 481-456). Tian Chang made himself Counsellor-in-chief of the state of Qi. In this position, he was able to execute whomever he liked, especially members of the other noble houses relative to the royal line. He was posthumously granted the name of Viscount Cheng (Tian Chengzi 田成子).