A high entropy alloy, Al8Co17Cr17Cu8Fe17Ni33, has been developed from an equiatomic AlCoCrCuFeNi alloy. Due to its promising properties, such as high corrosion and oxidation resistance and high thermal stability, it is a candidate for various applications at elevated temperature as, e.g., furnace parts, tools and moulds. The exploration of new metallic systems for high-temperature applications is an important challenge in today’s materials science.