This article analyzes the impact of both, International Human Rights Law – applicable in times of peace – and International Humanitarian Law – applicable in times of armed conflict – on the protection of the internally displaced population in Colombia. It explores the scope of the Guiding Principles on Internal Displacement of United Nations and its application by the Colombian Constitutional Court in the Sentence T-025 of 2004. It identifies areas for further development and concludes that, in this case study, the interpretation and application of the Law made by the Colombian Constitutional Court includes and integrates international and internal rules