Zhang Heng (AD 78–139) was a Chinese astronomer and mathematician who lived in the early Eastern Han dynasty.

Zhang Heng may also refer to:

• 1802 Zhang Heng, an asteroid named after the astronomer
• Zhang Heng (張橫), a minor warlord involved in the Battle of Tong Pass (211) in the late Eastern Han dynasty
• Zhang Heng (Water Margin), a fictional character and one of the 108 outlaws in the novel Water Margin
• Zhang Heng (Taoist), one of the leaders of the Way of the Five Pecks of Rice
• Zhang Heng (rugby player), rugby player who won a medal in rugby sevens at the 2006 Asian Games

• Chang Heng (crater), a lunar crater named after the astronomer

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