Roy William Neill (born Roland de Gostrie, 4 September 1887 – 14 December 1946) was an Irish-born American film director best known for producing and directing almost all of the Sherlock Holmes films starring Basil Rathbone and Nigel Bruce, made between 1943 and 1946 and released by Universal Pictures.

Neill also directed additional scenes, without screen credit, for Frank Capra's 1932 feature American Madness.

British film producer Edward Black hired Neill to direct The Lady Vanishes.

His best-known Universal feature, apart from the Sherlock Holmes pictures, is Frankenstein Meets the Wolf Man (1943).

In August 1944, the studio assigned Roy William Neill to expand the half-hour sequence into a full-length feature called The Fugitive.