Sir Robert Reginald Frederick Butler, 1st Baronet (19 June 1866 – 19 November 1933) was an English businessman.
Butler was born in Devizes, Wiltshire, and educated at Bedford School. He was director of a number of catering and confectionery companies, notably chairman of United Dairies. He was created a Baronet in the 1922 New Year Honours for his wartime services.