Sadakichi Hartmann (1867-1944) was a writer, poet, dramatist, and critic during the early 20th century. Hartmann was an important figure in early modernism and had a diverse social circle that included Walt Whitman, Ezra Pound, and John Barrymore. This collection includes Hartmann's published works, unpublished manuscripts, correspondence, photographs, pastels, paintings, and diaries.

This collection is an aggregation of materials by or about Sadakichi Hartmann and his immediate family members.