Publisher Summary This chapter provides various processes for producing polymer thin films, but whatever the deposition process (extrusion coating, wet or dry methods), the properties of the resulting film will depend strongly on the chemical nature of the polymer used. However, the numerous interactions between the process and material parameters significantly influence the final properties. Also it is very important to control the process parameters for maximum optimization of the target properties. With control of these processes becoming more and more developed, films with an increasingly fine structure can be obtained (e.g. nanometric scale for PECVD). This in turn produces properties with very high performance. The resulting thin films are used by traditional industries such as packaging and steel, but because there is enormous progress in the area of structure and properties, new emerging markets are focusing on the latest generation of polymer films.