Writer Kirk Ellis, producer Doug Ellin and Steven Spielberg's Amblin TV are all on board the project, which will follow Davis' Tubman, whose courageous acts leading slaves to freedom via the Underground Railroad and later fighting with the Union during the Civil War, made her an American hero.
Justin Falvey, Darryl Frank, Ellin, Jim Lefkowitz, Cliff Dorfman, Davis and Julius Tennon are all executive producers.
The untitled film is based Kate Clifford Larson's book "Bound for the Promised Land: Harriet Tubman: Portrait of an American Hero."
Davis currently plays Annalise Keating on ABC drama "How to Get Away With Murder," set to return for a second season on ABC in the fall. She'll next be seen as Amanda Waller in Warner Bros' DC comics adaptation "Suicide Squad."