The Rocky Mountain Rangers were one of the volunteer militia units raised in Canada's North West in response to the 1885 North-West Rebellion. It was a body of mounted irregulars, mostly cowboys and ranchers from the area around Fort Macleod, the headquarters of the North-West Mounted Police (NWMP) at the base of the foothills of the Rocky Mountains, about 150 miles (240 km) west of Medicine Hat. This unit is not to be confused with the present-day Canadian Army Reserve unit The Rocky Mountain Rangers of Kamloops, British Columbia. Rather, it is the ultimate ancestor of the South Alberta Light Horse (SALH).

The Rocky Mountain Rangers is a Primary Reserve infantry regiment of the Canadian Army, one of only four infantry regiments in British Columbia, and the only infantry unit that recruits in Northern BC and much of the Interior. The regimental headquarters are at JR Vicars Armoury in Kamloops, with an additional rifle company in Prince George. The Rocky Mountain Rangers are part of the 3rd Canadian Division's 39 Canadian Brigade Group, the brigade responsible for Canadian Army organization in British Columbia.