The purpose of this study is to provide a systematic overview of piano concertos written by Korean composers in the Twentieth-Century, using the format of an annotated bibliography. This project is of vital significance for musicians who wish to further expand their knowledge of the repertoire in this genre. In particular, this research serves as an important vehicle for those with a special interest in contemporary works, music by Korean composers, and for those who are looking for a contemporary source outside the scope of the standard piano concerto literature. The study provides commentary on the compositional and performance aspects of each work to serve as guideline for the consideration of professional performers, teachers, and conductors. The essay contains the works of twenty-five piano concertos by twenty-two composers; however, due to the lack of information this study will cover only nineteen piano concertos with compositional features and additional information. Most of the works are unpublished, but were collected through correspondence with the composers, as well as additional information from the Korean National Library of Congress, and online sources. The results of this research are intended to contribute musicological and ethnomusicological documentation of unknown works, repertoire source material for performing musicians, and bibliographic assistance in Korea to document and organize its own cultural output. In Chapter 4, the bibliography is arranged alphabetically by the composer's last name, and each work provides the biography of the composer, date of composition, commission and/or dedication, premiere performance, number and title of movements, duration, publication information, recorded performances, published reviews, composer's comments, and compositional features.