Huai may refers to:
- Huai Army, Chinese military force in the Qing Dynasty
- Huai of Xia, Chinese ruler of the legendary Xia Dynasty
- Huai River, in China
- Emperor Huai of Jin (284-313), Chinese emperor of the Jin Dynasty
- Prince Huai of Chu, two Chinese historical personalities
- Huai'an, city in Jiangsu, China
- Huaihai Campaign, military action during 1948 and 1949 in the Chinese Civil War
- Huai Khwang, district of Bangkok, Thailand
- Huainanzi, 2nd century BCE Chinese philosophical
- Huai-nan Love
- Huai Su
- Huai Yot