Jiankang (建康城 in pinyin: Jiànkāng chéng), formerly known as Jianye (建業 Jiànyè) until Eastern Jin Dynasty (317 - 420), is an ancient city in China, located west of present-day Nanjing, in south Jiangning County (江寧縣 Jiāngníng Xiàn). It was in the Sui Dynasty that Jiankang renamed to Jiangning.

Ruins of Jiankang's city walls can still be seen today. It used to be the capital city of the Three Kingdoms and Six Dynasties.

During the Three Kingdoms it was the capitol of the Kingdom of Wu lead by Sun Quan