Recently a new class of high entropy alloys (HEA) has received a lot of attention and its design is considered as a deviation from traditional multi-components intermetallic alloy systems. The HEA systems contain at least five principle elements, each of which has an atomic percentage between 5 at.% and 35 at.% . It has been reported that HEAs possess many attractive properties, such as high hardness, outstanding wear resistance, good fatigue resistance characteristics, excellent high-temperature strength, good thermal stability and, in general, good oxidation and corrosion resistance. These properties suggest HEAs have a great potential in a wide variety of Navy applications. The US Navy is particularly interested in high strength and light weight alloy materials. We are currently collaborating with University of Tennessee and Oak Ridge National Lab to develop HEAs for use in Navy applications. Some of the interested HEAs materials will be presented in the lecture.