Hai'an () is a county-level city in Jiangsu, China.

Haian or Hai'an may also refer to:

Hai'an Range (), on the eastern shore of Taiwan Hai'an Subdistrict (), Jinping District, Shantou, Guangdong Hai'an, Chenjiagang, Xiangshui, Yancheng, Jiangsu Chinese frigate Hai-an Chinese cutter Hai'an