 Polypropylene, PP, nanocomposites have been widely investigated over the past decade due to their enhanced mechanical, thermal, electrical, optical, and structural properties. These properties are attributed to the unique combination of structural, mechanical, electrical, and thermal transport properties of carbon nanotubes, CNTs. Despite the significant progress made in the field, there remains a lack of understanding regarding the relationship between the microstructure and the properties of these composites. This paper provides a comprehensive review of the existing literature related to PP slash CNTs nanocomposite preparation methods and property studies. This article was authored by Demetrius Baikiaris.