The subject matter of the Romantic organ sonata is viewed in the article from a general, wide perspective, therefore providing additional background concerning its status. In particular, the issues discussed include the following aspects: lists of sonatas with nationalities of their composers, time limits of the Romantic organ sonata, kinds of sonata cycle structure, specific characteristics of forms applied in the particular parts of the cycle and their location within its different variants, as well as the final conclusions. The text is completed with the annexes and tables which illustrate the issues discussed. During the research 246 sonatas had been identified, of which nearly 70% were analyzed. The note transcription of the remaining works proved unavailable. The key role in the emergence and development of the Romantic organ sonata was played by German composers. Their sonatas make over a half of all the identified pieces. The predecessors were: Felix Mendelssohn-Bartholdy and August Ritter. Their suggested cycle structure and the features of their organ sonatas defined the direction of the genre’s development, which was confirmed by the works of other German composers, as well as those of other nationalities. The significant group of composers writing organ sonatas is made by British authors (41 sonatas, 26 composers), whereas the list of French creators is rather short. In other countries there were few composers who wrote a small number of sonatas. There are also countries in which not a single organ sonata was found. This article is the first attempt to present the overview of the Romantic organ sonata in Polish professional literature.