The large N c limit of QCD on the lattice.

We review recent progress in the study of the large N c limit of gauge theories from lattice simulations. The focus is not only the planar limit but also the size of O ( N c - 1 ) corrections for values of N c ≳ 3 . Some concrete examples of the topics we include are tests of large- N c factorization, the topological susceptibility, the glueball, meson and baryon spectra, the chiral dependence of masses and decay constants, and weak matrix elements related to the Δ I = 1 / 2 rule in kaon decays.