Katherine Stieglitz, or Katherine Stieglitz Stearns, (September 27, 1898 – November 20, 1971) was the daughter of Emmeline, or Emmy, and Alfred Stieglitz, an American photographer and modern art promoter. She was the subject of many of her father's photographs, particularly in her early years. They were exhibited and received praise for their wholesome sentiment. She graduated from Smith College before marrying Milton Sprague Stearns. After the birth of her son in 1923, she was institutionalized for depression and hallucinations and remained there until her death in 1971.