The focus of this study is to provide a clear understanding of Vaughan Williams' Violin Concerto in D Minor. In terms of form and compositional technique, this concerto is particularly challenging, because of Vaughan Williams' use of rhythmic motives and modes. This study is undertaken through an analysis. For a better understanding, a historical background, including overall form of each movement and key relationships, is explored and discussed. Then, Vaughan Williams' use of a ritornello-like motive, melody and modality as unifying elements is also identified and examined. In identifying the major features of Vaughan Williams' compositional style of this violin concerto, musicians will be able to understand better his unique musical expression. This study may serve as an introduction to the music of Vaughan Williams for musicians and society worldwide. It is hoped that it will motivate all violinists to perform this concerto more frequently.