Introduction: This article is the product of the research "Knowledge management model for decision-making through ontologies for an employment and employability observatory" developed within the ComplexUD Research Group in the Universidad Distrital Francisco José de Caldas between 2018 and 2020. Objective: The objective of this research is the construction of a knowledge management model using ontologies of the actors involved in the employability process. Methodology: The construction of knowledge was carried out through the creation of ontologies, which describe the conceptual components of each actor that participates in employability, since their interaction forms the proposed model. Conclusion: It is observed that representing the actors through ontologies allows the behavior among them to be modeled in a way that is very close to reality, however, it must be taken into account that the components that describe the actors can change over time, for what is necessary a periodic update of the model. Originality: This document proposes original ideas regarding the definition and behavior of the actors identified in the development of the research, if the work of other authors is mentioned throughout the article, it is cited according to the norms established by its publication.