Refractory complex concentrated alloys (RCCAs), which also include refractory high entropy alloys, are widely studied as candidates for high temperature applications. They are based on three or more refractory elements, have BCC or B2 matrix and may have non-refractory elements and secondary phases. Knowledgeable selection of alloying elements allows production of RCCAs with a wide range of densities and mechanical properties. Simultaneous presence of BCC and B2 phases in some of RCCAs may result in a coherent, superalloy-like nano-phase structure and unique mechanical properties. This new field of research still experiences many challenges, and the effects of the combinations of the alloying elements, thermal and thermo-mechanical processing conditions on the microstructure, mechanical properties and oxidation behavior need to be understood. High-temperature strengthening and deformation mechanisms operating in RCCAs need to be explored. This talk will review current RCCA efforts and will develop ideas to guide future research.