Xu Heng (Chinese: 許衡) (1209–1281) was a Confucianist and educator of the Yuan Dynasty in China.
Xu Heng was born in present-day Xinyang of Henan Province, which was then governed by the Jin dynasty.
In early 1230s, when the Jin dynasty was annihilated by the Mongols, he was captured, but soon freed.
He resigned next year, but was invited again later by Kublai Khan, and became an official of the Central Secretariat (Zhongshu Sheng).
Xu Heng was then devoted to education, and actively supported the spread of Neo-Confucianism.