Linked from
The 46 pages that link to Gauge theory, each with the reason it gives.
Quantum chromodynamicsNarrower topic: QCD is a non-Abelian gauge theory with local color symmetry.
Steven WeinbergNarrower topic: Weinberg built electroweak unification as a gauge theory.
Lattice gauge theoryNarrower topic: Lattice gauge theory discretizes this broader class of theories.
Gauge fixingNarrower topic: Gauge fixing is a procedure used within this broader class of theories.
Yang Chen-NingNarrower topic: Yang–Mills theory extended gauge theory beyond electromagnetism.