Background: Tinea capitis is an infectious disorder caused by dermatophytes that occurs primarily in children. Its incidence rate in Korea has decreased considerably because of introduction of oral antifungal medications and implementation of concerted public health initiatives. Objectives: We investigated changes in the epidemiological and mycological characteristics of tinea capitis patients under the age of 10 in Korea. Methods: We retrospectively investigated the characteristics of 786 patients with tinea capitis, using medical records from Kyungpook National University Hospital and the Catholic Skin Disease Clinic from 1989-2018. Results: The annual incidence of tinea capitis decreased, from 560 patients in 1989-1998 to 75 patients in 2009-2018. Of the 786 patients, 446 (56.74%) were male and 340 (43.26%) were female. 577 (73.41%) lived in urban areas, and 209 (26.59%) in rural areas. In terms of the seasonality, 276 (35.11%) visited hospital in winter, 193 (24.55%) in spring, 177 (22.52%) in fall, and 140 (17.81%) in summer. 744 patients were KOH-positive and dermatophytes were cultured from 628 patients. Microsporum canis (73.16%) was the most common dermatophytes, followed by Trichophyton verrucosum (2.04%). Conclusion: Changes in the epidemiological and mycological characteristics of children with tinea capitis were shown. Though the incidence has fallen, continuous surveillance is needed to prevent tinea capitis in Korea.