Theodor Franz Jörgensmann (born 29 September 1948) is a German jazz clarinetist.
Theo Jörgensmann belongs to the second generation of European free jazz musicians. He was part of the clarinet renaissance in the jazz and improvising music scene. Jörgensmann is one of a few clarinet players for whom unaccompanied solo recordings are a significant part of his work.
He started to play clarinet when he was 18 years old. From 1969 until 1972 Jörgensmann took private lessons from a music teacher at the Folkwang Hochschule in Essen. At the same time he started working with fellow musicians from the Ruhr industrial area. During this time he was also a chemical laboratory assistant. After a one and half year hitch in the German Army Jörgensmann worked with handicapped children and studied social pedagogics, but he never brought it to a conclusion. Since 1975 he has been a professional musician.