Fort Garry, also known as Upper Fort Garry, was a Hudson's Bay Company trading post located at the confluence of the Red and Assiniboine rivers in or near the area now known as The Forks in what is now central Winnipeg, Manitoba.

Fort Garry was established in 1822, although its first iteration was destroyed in 1826 by severe flooding. The trading post was rebuilt in 1836 and served as the administrative centre for the Red River Colony. From 1869 to 1870, the fort was briefly occupied by Louis Riel and his Métis followers during the Red River Rebellion. The fort was demolished in the 1880s to make way for Winnipeg's Main Street, although the fort's gate remains.

The site of the former fort was designated as a part of a larger National Historic Site in 1924. Development of a provincial heritage site on the historic site of Fort Garry began in the early 21st century.

Fort Garry was established by the Hudson's Bay Company (HBC) in 1822 on or near the site of the North West Company's Fort Gibraltar established by John Wills in 1810 and destroyed by Governor Semple's men in 1816 during the Pemmican War. Fort Garry was named after Nicholas Garry, deputy governor of the Hudson's Bay Company. It served as the centre of the fur trade within the Red River Colony. In 1826, a severe flood destroyed the fort.

The fort was rebuilt in 1836 by HBC to help facilitate the administrative and supply needs for the Red River Colony. The new fort was named Upper Fort Garry to differentiate it from "the Lower Fort," or Lower Fort Garry, 32 kilometres (20 mi) downriver, which was established in 1831. Throughout the mid-to-late 19th century, Upper Fort Garry played a minor role in the actual trading of furs but was central to the administration of the HBC and the surrounding settlement. The Council of Assiniboia, the administrative and judicial body of the Red River Colony mainly run by Hudson's Bay Company officials, met at Upper Fort Garry.

In 1869, the Hudson's Bay Company agreed to surrender its monopoly in the North-West, including Upper Fort Garry. In late 1869 and early 1870, the fort was seized by Louis Riel and his Métis followers during the Red River Resistance. After the Resistance, the area around the fort continued to grow. In 1873, the city of Winnipeg was established and the name Fort Garry was no longer used. In 1881–1884 the majority of the fort was demolished to straighten Main Street (it was at Main Street and Assiniboine Avenue).

Fort Garry, along with the sites of nearby Forts Rouge and Gibraltar, were collectively designated a National Historic Site in 1924, under the name "Forts Rouge, Garry, and Gibraltar National Historic Site". Together, the three sites are illustrative of the evolution of the fur trade in Western Canada, from exploration and expansion westward (Fort Rouge, established in 1738 by the French), to the dominance of the North West Company (Fort Gibraltar, established in 1807) and finally the ascendancy of the Hudson's Bay Company (Fort Garry). The gate at Fort Garry constitutes the only above-ground remains of this succession of forts.

On 15 June 1938 Canada Post issued 'Fort Garry Gate, Winnipeg', a 20¢ stamp.