Combinatorial screening approach, energy conversion, energy storage, high-entropy oxides, phase stability, structural characterization They also provide outlook for HEO materials as future energy storage/conversion materials as well as the research directions to solve critical issues to the full-throttled application of HEOs. Keywords: combinatorial screening approach; energy conversion; energy storage; high-entropy oxides; phase stability; structural characterization EN combinatorial screening approach energy conversion energy storage high-entropy oxides phase stability structural characterization 1 1 1 10/27/22 20221021 NES 221021 B High-Entropy Oxides b In article number 2205142, Lawrence Yoon Suk Lee, Kwangyeol Lee, and co-workers cover the significant advances in the field of high entropy oxides (HEO).