This review article discusses the various analytical techniques for the characterisation of Polymeric Nanoparticles (PNPs). Because of their distinctive qualities, they have gained a lot of attention in recent years. As a result, knowing their properties is important. In fact, a range of analytical techniques are used to investigate these features. It includes microscopic, spectroscopic, light scattering, and diffraction techniques. This article will provide you with a review of these characterisation methods and how they are used to study the properties of PNPs.