In the scope of consumption law, the definition of consumer has been one of the most difficult and troublesome to delimit. Several legislative definitions of consumers have been adopted in Compared law. Besides in Colombian law the legal definition of consumer has been delimited by the doctrine of the Superintendence of Industry and Commerce and by the case law of the Supreme Court of Justice. This article is the product of a research that intends to take a tour in the scope of Compared and Colombian law with the purpose of establishing the advancements, the common points and the difference in the definition or notion of consumer in these fields of law. For this purpose have been used the legal definitions and the doctrine com- ments existing in Compared law in regards to this topic, making special emphasis in the European Community Law and in the case law of the Court of Justice of the European Community, in which the protection to consumers has had ample deve- lopment. The main result is that the definition of consumer in most cases is legally delimited and is set forth as the entity or person acquiring goods or services as final users, for utilizing it or them as personal, family or household use (non professional)