The Honourable John James Garden Ramsay (1827 – 20 January 1890) was an industrialist and politician in colonial South Australia. Ramsay was born in Edinburgh, Scotland, and served his apprenticeship as an engineer at the St. Rollox Ironworks in Glasgow, and came to South Australia in 1857, establishing four years later at Mount Barker an agricultural implement and machine manufactory, which represented the starting point of what later grew into the largest business of its kind in the colony.