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High-throughput omics platforms have pioneered our approach to understanding biological and cellular processes. Omics technologies provide powerful tools for studying various molecules, such as genes, proteins, and metabolites, in a particular state and at a particular time. Although omics has had a presence in the radiation community for more than 3 decades, the use of it is still in its infancy. Omics studies enable radiation researchers to understand the molecular mechanism underlying the biological effects of radiation exposure on normal and cancerous tissues, and to answer critical questions such as individual sensitivity, risk assessment, and biomarker discovery. In this commentary, we take a look back at the omics studies that have been conducted in radiation research in the last 20 years and discuss whether omics has fulfilled expectations by examining the knowledge and research gaps in radiation omics.