Colloidal Dispersions Under Slit Pore Confinement This dissertation contributes to the understanding of fundamental issues in the highly interdisciplinary field of colloidal science. Beyond colloid science the system also serves as a model for studying interactions in biological matter. This work quantitatively investigated the scaling laws of the characteristic lengths of the structuring of colloidal dispersions and tested the generality of these laws thereby explaining and resolving some long standing contradictions in the literature. It revealed the effect of confinement on the structuring independently of specific properties of the confining interfaces. In addition it resolved the influence of roughness and charge of the confining interfaces on the structuring as well as providing a method to measure the effect of surface deformability on colloidal structuring.