Abstract Objective Concurrent chemoradiotherapy is the standard treatment for locally advanced non-small cell lung cancer. In the current aging society, the establishment of an ideal treatment strategy for locally advanced non-small cell lung cancer in the elderly is warranted. To assess the efficacy of concurrent chemoradiotherapy with carboplatin and vinorelbine in elderly patients with locally advanced non-small cell lung cancer. Purpose To assess the efficacy of concurrent chemoradiotherapy with carboplatin and vinorelbine in elderly patients with locally advanced non-small cell lung cancer. Methods This multicenter, phase II study included patients with physiologically or medically unresectable stage I-III NSCLC, who were ≥70 years old. The patients received carboplatin (AUC 2) and vinorelbine (15 mg/m2) both on day 1, 8, 22 and 29 concurrently with radiotherapy (2.0 Gy/day, 30 fractions, total 60 Gy). The primary endpoint was the objective response rate. The secondary endpoints were the progression-free survival, overall survival and the incidence of adverse events. Results 50 patients were accrued (42 men and 8 women). The median age was 77 years (range, 70–89 years) and the clinical stage was I/II/III in 3/7/40, respectively. Forty-seven patients completed the planned treatment. The response was complete remission in 4, partial response in 31, stable disease in 12 and progressive disease in 3, giving an objective response rate of 70% (95% confidence interval: 55.4–82.1). Frequent high Grade 3 or higher adverse events were hematologic, but no treatment deaths were noted. The median and 2-year progression-free survival were 8.4 months and 21.1% (95% confidence interval: 9.5–32.7%), respectively, and the median and 2-year overall survival were 15.4 months and 41.1% (95% confidence interval: 27.0–55.2), respectively. Conclusion Concurrent chemoradiotherapy with carboplatin and vinorelbine showed an acceptable objective response rate and safety in elderly patients. The appropriate treatment for elderly patients with locally advanced non-small cell lung cancer is necessary. This phase II study of concurrent chemoradiotherapy met its null hypothesis in response with safety.