Dorothy Kathleen Broster (2 September 1877 - 7 February 1950), usually known as D. K. Broster, was a British novelist and short-story writer.

Born in Garston, Liverpool at Devon Lodge (now known as Monksferry House), which lies in Grassendale Park on the banks of the River Mersey, she was educated at Cheltenham Ladies’ College and St Hilda’s College, Oxford (where she was one of the first students). She served as a Red Cross nurse during World War I with a voluntary Franco-American hospital. Following the war she returned to Oxford where she worked as a secretary to the Regius Professor of History and senior civil servants.

Broster’s first two novels, Chantemerle: A Romance of the Vendean War (1911) and The Vision Splendid (1913), were co-written with Gertrude Winifred Taylor. A number of further novels followed after war end, including her best-seller about Scottish history, The Flight of the Heron (1925). This was followed up with two successful sequels, The Gleam in the North (1927) and The Dark Mile (1929) and became known as the Jacobite Trilogy.

She also wrote several short horror stories, collected in "A Fire of Driftwood" and Couching at the Door. The title story of "Couching at the Door" involves an artist haunted by a mysterious entity. Other supernatural tales include "Clairvoyance" (1932), about a psychic girl, "Juggernaut" (1935), about a haunted chair, and "The Pestering" (1932), focusing on a couple tormented by supernatural entity.

She died in 1950 aged 72.