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Recently, manganese oxides (MnO_x)/cerium(IV) oxide (CeO₂) composites have attracted widespread attention for the selective catalytic reduction (SCR) of nitrogen oxides (NO_x) with ammonia (NH₃), which exhibit outstanding catalytic performance owing to unique features, such as a large oxygen storage capacity, excellent low-temperature activity, and strong mechanical strength. The intimate contact between the components can effectively accelerate the charge transfer to enhance the electron–hole separation efficiency. Nevertheless, MnO_x/CeO₂ still reveals some deficiencies in the practical application process because of poor thermal stability, and a low reduction efficiency. Constructing MnO_x/CeO₂ with other semiconductors is the most effective strategy to further improve catalytic performance. In this article, we discuss progress in the field of MnO_x/CeO₂-based ternary composites with an emphasis on the SCR of NO_x by NH₃. Recent progress in their fabrication and application, including suitable examples from the relevant literature, are analyzed and summarized. In addition, the interaction mechanisms between MnO_x/CeO₂ catalysts and NO_x pollutants are comprehensively dissected. Finally, the review provides basic insights into prospects and challenges for the advancement of MnO_x/CeO₂-based ternary catalysts.