This diploma thesis called "The analysis of selected choral compositions by Jakub Jan Ryba" deals primarily with his religious works. The introductory chapter briefly describes Ryba's journey to music and the activity of a composer and the text is also based on Ryba's own biography published in 2005 titled My Life and Music. The thesis concerns an extant autographic list of his works dated to 1801 and an autographic fragment of an incipit catalogue of compositions dated from 1774 to 1796 including an incipit of Czech Christmas Mass "Hey, Master!" dated back to 1795. Both lists were compared with two electronic music databases: the catalogue of the department of music history, National Museum - the Czech Museum of Music and the musical incipit catalogue of the National Library of the Czech Republic. The electronic databases were further compared with the thematic catalogue which is a part of the monography titled Jakub Jan Ryba published in 1963. The object of interest was also the quantity of autographs and transcripts and the prints of the works by Jakub Jan Ryba which have been issued from the beginning of the 19th century till present. Regarding the results of the research, it was proved that only a part of Ryba's work has survived up till now since Ryba himself presents 1083 compositions, both...