Equivalence theorem may refer to:
Economics Ricardian equivalence, a principle in economics Revenue equivalence, a concept in auction theory
Mathematics and physics Compass equivalence theorem, a theorem in straightedge and compass construction Equivalence principle, in general relativity Lax equivalence theorem, a theorem in the analysis of finite difference methods Optical equivalence theorem, a theorem in quantum optics Surface equivalence principle, a principle in electromagnetism and antenna theory