2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52990To appear in Encyclopedia of Mathematical Physics, published by Elsevier in early 2006. Comments/corrections welcome. The article surveys topological aspects in gauge theories.23 pages, 2 figures, to appear in Encyclopedia of Mathematical Physics in 2006High Energy Physics - TheoryMathematical PhysicsClassical Physicstext