The purpose of this thesis is to analyze the structure of Anton Bruckner's Fourth Symphony in E-flat ("Romantic"). My analysis concentrates on the motivic organization of the symphony's opening two themes. Contained within these themes are two motives that generate much of the material that follows in each of the four movements. In fact, Bruckner employs little material that does not directly trace its origin to these principal motives. A major part of my thesis is devoted to examining how these principal motives are used and transformed. My analysis of each movement commences with a brief discussion of the forms and themes employed. It is then followed by an examination of the motivic organization. As the analysis progressed, it became clear that the motivic structure is interlinked with the basic harmonic structure: many key relationships were found to be directly related to the intervallic content of the motives, particularly the first. Following the motivic and thematic analysis of each movement, there is a section dealing with the harmonic structure, especially insofar as it is influenced by the overall motivic considerations. The conclusions reached indicate that the majority of the thematic material as well as the harmonic relationships are directly generated from the two principal motives