Chianan, Chia-nan, or Jianan may refer to:
Chiayi–Tainan Plain, also known as the Chianan or Jianan Plain (, Jiānán Píngyuán), a large plain on Taiwan Island Chianan Irrigation (, Jianán Dàzùn), also known as the Kanan Irrigation, used by farms in the Taiwanese plain
See also Wang Jianan (disambiguation) Jian'an (disambiguation) or Chien-an, sometimes misspelled as Jianan or Chianan Kanan (disambiguation), the Japanese pronunciation of the same characters