In this study it has been investigated the structure of the High-Entropy Nano-Alloys, materials that combine four or more metals in equiatomic composition. Mixing many elements at equiatomic composition in an alloy favors the formation of a solid solution crystallized in a cubic phase. The term "high entropy alloy" derives from the fact that this solid solution phase is stabilized by the high configurational entropy of the alloys. High-Entropy Alloys (HEA) have evolved to one of the most popular material classes in the last decades in both fundamental and applied material science. However research has been focused entirely on bulk HEA, ignoring HEA nanoalloys because of the absence of well controlled methods to synthetize such complex nanoparticles (NPs).