Witness is a 1985 American neo-noir crime thriller film directed by Peter Weir, from a screenplay by Earl W. Wallace and William Kelley. It stars Harrison Ford as a police detective protecting an Amish woman (Kelly McGillis) and her son (Lukas Haas), who becomes a target after he witnesses a brutal murder in a Philadelphia railroad station. The film was based on scripts that Wallace and Kelley had written for the Western television series How the West Was Won and Gunsmoke years prior. Filming took place in Lancaster County and Philadelphia, Pennsylvania.