This text has as its main purpose the study of the unconstitutional legislative omission, wherever there is a confrontation between, on the one hand, the faculty of the Constitutional Court to exercise control of the laws issued by the legislator, and on the other hand, the Congress´ freedom of legislative configuration. For this study we depart from the international doctrine and the jurisprudence of Constitutional Court of Colombia, analyzing them together to identify the coincidences, differences, definitions, methods as well as solutions proposed to this constitutional matter.