Sum rule may refer to:
- Sum rule in differentiation, Differentiation rules #Differentiation is linear
- Sum rule in integration, see Integral #Properties
- Addition principle, a counting principle in combinatorics
- In probability theory, an implication of the additivity axiom, see Probability axioms #Further consequences
- Sum rule in quantum mechanics
- QCD sum rules, non-perturbative techniques in quantum chromodynamics
- Sum rules (quantum field theory), relations between static and dynamic quantities in quantum field theory
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