Abstract In this work attempts were made to establish correlation between rheological and morphological properties of nanoclay-filled polypropylene/ethylene vinyl acetate copolymer (PP/EVA) blends containing a new generation of halogen-free flame retardants commercially known as "NOR116". Scanning electron microscope (SEM), transmission electron microscope (TEM) and wide angle X-ray scattering (WAXS) analyses were implemented in order to investigate the morphological properties. Effect of presence of two different types of compatibilizer, the flame retardant and organoclay on morphology of the nanocomposites was explored. By considering chemical nature of compatibilizers and the SEM and TEM micrographs, organoclay localization was accurately predicted. Using rheological measurements in three different modes of frequency, temperature and time sweeps, linear viscoelastic properties alterations of the samples in terms of temperature variations and consequent morphological evolution were investigated. Using the frequency sweep experiment miscibility level of blends and their interfacial properties were also studied. A good correlation between these properties and morphological observations was established. Also, it was found that the temperature dependence linear viscoelastic properties alterations strictly depend on the blend morphology and chemical structure of components. In case of neat blend a single phase morphology indicating of enhanced miscibility was detected at higher temperatures.