Peter Dettweiler (born August 4, 1837 in Wintersheim, † January 12, 1904 in Kronberg im Taunus) was a German pulmonologist. Due to a hemorrhage, Peter Dettweiler, who had been suffering from a lung disease since his student days, went to the sanatorium in Görbersdorf / Silesia in 1868, which was run by the doctor Hermann Brehmer. After his recovery, Dettweiler accepted Brehmer's offer in 1869 and stayed in Görbersdorf as his assistant doctor. It was there that the young doctor got to know Brehmer's groundbreaking measures in the treatment of consumption. Frankfurt doctors who dealt with the treatment of pulmonary tuberculosis, which was widespread at the time, opened the Falkenstein pulmonary hospital in the Taunus in 1875. In 1876 the management was transferred to Peter Dettweiler. Under Dettweiler's direction, the Falkensteiner pulmonary hospital achieved significant international fame in a very short time. Doctors from Davos in Switzerland and France found out about the effectiveness of Dettweiler's tuberculosis therapy in Falkenstein. For health reasons, Peter Dettweiler retired from the management of the clinic in 1895. With his departure, the Falkenstein sanatorium lost its validity and had to be closed in 1907 due to economic difficulties; it was eventually torn down for fear of infection.
Peter Dettweiler, the Secret Sanitary Councilor and first honorary citizen of Falkenstein, died of cardiac death in Kronberg in 1904 at the age of 67. Dettweiler's guidelines for tuberculosis therapy had spread all over the world.