The thesis investigates the musical and lyrical impact of Bob Dylans music on the songs of the Beatles. The Beatles are among the most talented and important bands in music history and had a significant influence on many other bands. What is often disregarded, however, is that the Beatles, too, were influenced by a number of factors that helped shape their musical style and motivated them to become successful as a band. More precisely, the thesis explores the question to what extent and in which manner Dylans music influenced the Beatles lives, their musical development and their career as a band. Therefore, an outline of the Beatles musical development, including an investigation of their song writing style, is given. The song writing team Lennon/McCartney in particular is scrutinized, as well as their differences and similarities, the manner in which they worked together and how Lennon and McCartney benefited from their collaboration. Furthermore, an overview of Dylans development as a musician, with the main focus on his career as a folk singer, is presented. Based on Dylans involvement in the folk music scene of the 60s, the backgrounds of the American folk revival are examined by taking the development of the American folk song into account. Moreover, the thesis attempts to characterize Dylans song style so as to create a framework for the analytical part. Prior to the analytical the early musical styles of Dylan and the Beatles are contrasted in order to determine similarities and differences between the artists. Based on the framework and information gathered in secondary literature, the Beatles work is investigated with the aim of identifying Dylans potential influence on their music and lyrics. The analytical part of this thesis has revealed a series of potential lyrical as well as musical aspects and facts regarding an impact of Dylan on the Beatles work. However, it cannot be proved with certainty to what extent he really affected their work.