Lecture, four hours. Requisite: course 230B. Quantization of non-Abelian gauge theories. Topics include functional integral quantization of Yang-Mills fields, Faddeev-Popov ghosts, perturbative expansion of non-Abelian gauge theories and Feynman rules, background field method, one-loop renormalization of Yang-Mills theory, asymptotic freedom, global internal symmetries, Ward identities, non-linear realizations, Higgs mechanism, anomalies in non-Abelian gauge theories. S/U or letter grading.