HEU may refer to:

• Harbin Engineering University
• High-enriched uranium
• Hospital Employees' Union

• Relative state
• Relative state formulation
• Relative Strangers
• Relative strength
• Relative surplus population
• Relative survival
• Relative tensor product
• Relative term
• Relative to a base
• Relative uncertainty
• Relative URL
• Relative valuation
• Relative Valuation
• Relative value (economics)
• Relative Values (film)
• Relative vector
• Relative velocity
• Relative Virtual Address
• Relative viscosity
• Relative volatility
• Relative wind
• Relative Wind
• Relative yield
• Relativism in ethics
• Relativistic aberration formula