This article examines the different approaches to the notion of political-administrative interface in sociology, political science and administrative science. As a complex reality, the politicaladministrative interface is the critical link of the democratic system. Through the politicaladministrative interface, we understand the very close collaboration space between high elected officials and senior civil servants. The complexity of the political-administrative interface relations in a democratic regime is due to several factors, such as the structural and functional variables, of course, but also the conjuncture factors.