Feng Ba (died 430), courtesy name Wenqi, nickname Qizhifa, formally Emperor Wencheng of (Northern) Yan, is an emperor (but using the title "Heavenly Prince" (Tian Wang)) of the Chinese state Northern Yan.

He becomes emperor after Gao Yun (Emperor Huiyi), whom he had supported in a 407 coup that overthrew Murong Xi of Later Yan, is assassinated in 409.

During his reign, Northern Yan largely maintaind its territorial integrity but makes no headway against the much stronger rival Northern Wei.

He is said to have had more than 100 sons, but after his death in 430, his brother and successor Feng Hong (Emperor Zhaocheng) has them all executed.