Dr. Hart's Diary (German: Das Tagebuch des Dr. Hart) is a 1917 German silent war film directed by Paul Leni and starring Heinrich Schroth, Käthe Haack and Dagny Servaes.
The film depicts a German field hospital in occupied Russian Poland during the ongoing First World War.
The film was created as part of a major effort to propagandize the German-Polish friendship that leads to the re-establishment of Poland by German forces in late 1916.
It was produced by Paul Davidson's PAGU in association with the propaganda agency BUFA.
Shortly afterwards, hoping to produce a number of similar films, the German government founded UFA which PAGU merged into.