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Stress fracture of the anterior process of the calcaneus is a rare condition, especially without calcaneonavicular coalition. We present the case of a 13-year-old female basketball player who developed right ankle pain without obvious injury. There was tenderness on the right anterior inferior lateral malleolus, and a fracture of the anterior process of the calcaneus was confirmed by magnetic resonance imaging. There was tenderness on the right anterior-inferior malleolus and a fracture of the anterior process of the calcaneus was confirmed by magnetic resonance imaging. Since computed tomography showed sclerotic change around the fracture, we diagnosed it as a stress fracture. As the bone fragment was relatively large, internal fixation was performed. After confirming bony fusion, she was allowed to jog and return to playing basketball. No recurrence of symptoms was observed at the 1-year follow-up. The cause of the stress fracture in this case was considered to be an unusually long anterior process of the calcaneus; this should be suspected to guide intervention better in such cases.