112 p. Recurso Electr?nicoAn?lisis de los preacuerdos en el sistema penal acusatorio colombiano desde la perspectiva constitucional y legal, es una reflexi?n cr?tica acerca de los fundamentos de la figura de los preacuerdos como adaptaci?n de la justicia negociada anglosajona. En esta investigaci?n se revisan los antecedentes hist?ricos de la justicia negociada y el desarrollo normativo penal en Colombia que da cuenta del papel del sistema acusatorio como pol?tica criminal del Estado, cuya consumaci?n inicia con la Constituci?n de 1991, y los derechos fundamentales que sustentan el sistema, seguida del Acto legislativo 03 de 2002, que adecu? la estructura normativa para que fuera posible la expedici?n de la Ley 906 de 2004 con la que se materializ? su implementaci?n, todo este proceso enmarcado en una serie de conflictos que van desde la confrontaci?n de la cultura jur?dica anglosajona con la cultura jur?dica nacional, hasta los inconvenientes sociales, pol?ticos y econ?micos que implica. La realizaci?n de preacuerdos conlleva la renuncia de derechos por parte del acusado y la flexibilizaci?n del ius puniendi que se traduce en procesos en los que el juez no individualiza la pena, ni realiza control material sobre la adecuaci?n t?pica de la conducta, no ejerce inmediaci?n sobre los elementos materiales probatorios, y la verdad material no es objeto de debate dentro del proceso, por lo que tambi?n se dificulta la realizaci?n de los postulados de verdad, justicia y reparaci?n integral que componen los derechos de las v?ctimas y de la sociedad. Palabras clave: Preacuerdos, Sistema Penal, justicia negociada, principio de legalidad.Analysis of the preliminary agreements in the Colombian accusatory criminal system from the constitutional and legal perspective is a critical reflection on the foundations of the figure of the plea bargaining, is the adaptation of Anglo-Saxon plea bargaining justice. This investigation reviews the historical background of negotiated justice and the normative criminal development in Colombia that accounts for the role of the accusatory system in the criminal policy of the State, whose consummation begins with the 1991 Constitution, and the fundamental rights that support the system, followed by Legislative Act 03 of 2002, which adapted the normative structure so that the issuance of Law 906 of 2004 was possible with which its implementation materialized, this whole process framed in a series of conflicts ranging from the confrontation of the Anglo-Saxon legal culture with the national legal culture, up to the social, political and economic inconveniences that implies. The making of preliminary agreements involves the waiver of rights by the defendant and the flexibility of the right to punish that translates into processes in which the judge does not individualize the punishment, nor does he perform material control over the typical adequacy of the conduct, does not exercise immediacy over the evidentiary material elements, and the material truth is not object of discussion within the process, reason why, also it is difficult the accomplishment of the postulates of truth, justice and integral reparation, that compose the rights of the victims and of the society. Keywords: Preliminary agreements, accusatory penal system, plea bargaining, principle of legality.