Gilbert Rotherdale McMinn CE, SM, FRGS (1841 – 18 October 1924) was an Australian surveyor born in Ireland noted for his work in the Northern Territory surveying the Overland Telegraph Line.

He was the son of a bank manager, Joseph McMinn (c. 1794 – 6 April 1874) and his wife Martha, née Hamill or Hammill (c. 1805 – 13 December 1861), who sailed with their eight children aboard the Albatross and arrived at Port Adelaide in September 1850.

[1] Gilbert McMinn was one of ten surveyors[2] and a support crew of around 100 men, under Surveyor-General George Goyder and Dr. Robert Peel, who left Adelaide for Port Darwin shortly after Christmas 1868[3] to survey Palmerston and regions, and most of whom returned to Adelaide on 25 November 1869.

he died in Mary Street, St. Kilda, Victoria on 18 October 1924 after a sudden heart failure at the age of 83.

[1] Among their children were:[citation needed] Two of McMinn's brothers also worked as surveyors on the Overland Telegraph Line: