Sir Frank Beaumont Moulden (25 June 1876 – 8 April 1932) was a lawyer in South Australia who served as Lord Mayor of Adelaide 1919–1921.
He was President of the local chapter of Alliance Française and in January 1919 succeeded J. W. Canaway (c. 1848–1923) as Consular Agent for France in South Australia.
Sir Frank Beaumont Moulden (1876-1932) married Deborah Vernon Hackett of Western Australia in 1918.
John Eldin Collett "Jack" Moulden (born 1873) of London was a brother, and Margaret Minna Moulden (born 1879), married John Wheeley Lea in 1902, later to Garnet Wolseley Bennett (died 1951) of Woodend, Victoria, was a sister.
Youngest brother Eldin Swanzy Moulden (1883–1919) was Chief Assistant Engineer of the Municipal Tramways Trust under W. G. T. Goodman.