Abstract <p>Electronic paramagnetic resonance (EPR) is an instrumental research method widely used in chemistry, physics, biology, and materials science, which can be successfully applied to characterize the electronic structure of carbon nanomaterials. This paper presents a brief overview of studies of various types of carbon nanostructures (CNSs) using the EPR method, including measurement techniques, principles of spectral data processing and interpretation, and experimental results. The relationship between the properties of CNSs and the nearest environment of paramagnetic centers, as well as the oxidation and degradation of materials over time, was analyzed.</p>