Radicular cysts (RCs) are one of the most common odontogenic cystic lesions of inflammatory origin. It originates mostly from epithelial residues in periodontal ligaments secondary to inflammation. The pathogenesis involves the activation of epithelial cell rests of Malaseez after physical, chemical, or bacterial injury. Radiographically, it is seen as a well-defined unilocular lesion of size >1.5 cm. RCs are considered rare in the primary dentition, comprising only 0.5-3.3% of the total number of RCs in both primary and permanent dentitions. This is the first case to be reported of a radicular cyst in primary teeth, with dystrophic calcification.Sunny R, Rag B, Punathil S, et al. A Rare Case of Calcified Radicular Cyst in Deciduous Tooth. Int J Clin Pediatr Dent 2024;17(1):86-88.