Objective: Allograft stones are rare but can cause rapid and severe obstruction of the graft, significantly decreasing graft and patient survival rates. Because allograft kidneys are solitary and patients are in an immuno-suppressed state, minimally invasive techniques, rather than open surgery, should be the treatment modality for allograft stones. Percutaneous nephrolithotomy (PCNL) is an optimal option for treatment of these patients. Material and methods: Records of patients with allograft stones, undergoing PCNL, under ultrasound guidance in our hospital from January 2007 to September 2017, were retrospectively reviewed. Results: This study identified 11 patients with allograft stones, treated with PCNL under ultrasound guidance. Presentation symptoms included hematuria in 18.2% of cases, pain in 27.3%, fever in 9.1%, and 45.5% were symptom-free. Average stone size was 1.43 cm (range 0.7 to 2.6 cm). KUB radiography or NCCT, 3-4 days after the procedure, demonstrated that 9 patients (81.8%) were stone-free. One patient needed medical expulsion therapy for residual stones and another underwent unsuccessful PCNL. Postoperative complications developed in 3 patients, including bleeding and fever. Conclusion: PCNL is an acceptable, safe, and reliable method for treatment of allograft stones. Puncture and dilation during percutaneous access of uniquely located grafts, however, remains a major challenge for successful PCNL.