In this section titled Theoretical Evaluation of the Effect of HfN, TaN, ScN and YN Reinforcements on Radiation Shielding Performance in FeNbVTaW Based High Entropy Alloys, it is emphasized that the demand for materials used in high radiation areas such as nuclear energy, space technologies and medical radiology is increasing in line with today's rapidly developing technologies. In this context, the need for new generation materials that can provide durable and effective radiation shielding has become important. High entropy alloys are materials obtained by combining more than one element in equal proportions and are more durable than traditional alloys. However, there are still limited studies on the radiation shielding performance of these alloys. In this section, how the radiation shielding capacity of HEAs can be improved by reinforcing them with metal nitrides (HfN, TaN, ScN, YN) is discussed in detail. Metal nitrides increase not only the mechanical performance but also the radiation shielding capacity of HEAs thanks to their superior properties such as high hardness, chemical stability and high melting point. Such alloys offer significant potential, especially in critical areas such as nuclear energy, space and defense industries. It is also emphasized that the combination of HEAs and metal nitrides provides great advantages in terms of armoring performance and cost effectiveness.