Hai'an (Chinese: 海安; pinyin: Hǎi'ān; Wade–Giles: Hai-an), originally named Zhen'an (simplified Chinese: 镇安; traditional Chinese: 鎮安; pinyin: Zhèn'ān; Wade–Giles: Chen-an), was a wooden steam powered frigate built for the Imperial Chinese Navy. She was the lead ship of the , which consisted of her and her sister Yuyuen. They were the largest vessels built in China until the 1930s; they each ran over budget and used sub-standard building materials which limited their use. Hai'an was initially used as a training ship, and later saw action in the Sino-French War as a potential blockship, being scrapped as a hulk following the war.