Huaihai

Huaihai may refer to:


 * Baizhang Huaihai (720–814), Chinese Zen master
 * Huaihai Campaign, 1948–1949 military action during the Chinese Civil War
 * Huaihai Institute of Technology, institute in Lianyungang, Jiangsu, China
 * Huaihai opera, traditional Chinese theatre
 * Huaihai Road, street in Shanghai, China