Agnes Sligh Turnbull
- Date of birth: October 14, 1888
- Died: January 31, 1982
- Born: in New Alexandria, Pennsylvania, The United States.
- Description: Novelist Agnes Sligh Turnbull was born in 1888 in New Alexandria, PA. After a dozen years as a short story writer, Turnbull wrote her first novel, The Rolling Years, published in 1936. In the 14 additional novels she wrote over the next 40-plus years, Turnbull built a thorough chronicle of the Scots who settled and farmed rural Westmoreland County. Turnbull died in 1982.