Major General Gustave Mario Ramaciotti, CMG, VD (13 March 1861 – 6 December 1927) was an Australian law clerk, theatrical manager and soldier who was well known in Sydney's legal services.

As managing clerk of the conveyancing department of Minter Simpson & Co, he became well known in Sydney legal circles until his retirement from law in 1904.

After selling his shares in J C Williamson Ltd he bought the Theatre Royal in King Street, Sydney, the neighbouring Sutton's Hotel and adjoining land at the rear of these properties.

During the First World War his duties were largely confined to home, but he eventually became Inspector General of administration at Army Headquarters, Melbourne.

He was survived by his children Clive and Vera and his estate was sworn for probate in New South Wales at £91,485.