During the First World War, the Canadian government authorized the formation of several mounted regiments, including cavalry and mounted infantry, to serve in the Canadian Expeditionary Force on the Western Front .
Three regiments, the Royal Canadian Dragoons, Lord Strathcona's Horse, and the Fort Garry Horse, were part of the Canadian Cavalry Brigade, attached to British Army cavalry formations.
One regiment, the Canadian Light Horse, was the Canadian Corps' cavalry regiment.
Six regiments of mounted rifles served initially at the front as mounted infantry before being converted to infantry battalions. The remaining mounted rifle regiments were raised in Canada but broken up in England to provide reinforcements for other cavalry, mounted infantry and infantry units.
The regiments in bold type served in the field.
| Regiment | Authorized | Disbanded | Perpetuation |
|---|---|---|---|
| The Royal Canadian Dragoons | 21 December 1883 | Extant | |
| Lord Strathcona's Horse (Royal Canadians) | 1 July 1901 | Extant | |
| The Fort Garry Horse | 15 April 1912 | Extant | |
| Canadian Light Horse | 19 May 1916 | 6 November 1920 | South Alberta Light Horse, 1st Hussars, and The North Saskatchewan Regiment |
| 1st Battalion, Canadian Mounted Rifles | 7 November 1914 | 15 November 1920 | The North Saskatchewan Regiment and 118th Medium Battery, RCA |
| 2nd Battalion, Canadian Mounted Rifles | 7 November 1914 | 6 November 1920 | The British Columbia Dragoons |
| 3rd Regiment, Canadian Mounted Rifles | 7 November 1914 | 12 August 1917 | The South Alberta Light Horse |
| 4th Battalion, Canadian Mounted Rifles | 7 November 1914 | 6 November 1920 | The Governor General's Horse Guards |
| 5th Battalion, Canadian Mounted Rifles | 7 November 1914 | 30 August 1920 | The Sherbrooke Hussars |
| 6th Regiment, Canadian Mounted Rifles | 7 November 1914 | 18 February 1918 | 87th Field Battery, RCA, 88th Field Battery, RCA, and 8th Canadian Hussars (Princess Louise's) |
| 7th Regiment, Canadian Mounted Rifles | 7 November 1914 | 11 April 1918 | The Governor General's Horse Guards |
| 8th Regiment, Canadian Mounted Rifles | 15 March 1915 | 8 December 1917 | 4th Princess Louise Dragoon Guards |
| 9th Regiment, Canadian Mounted Rifles | 7 November 1914 | 15 November 1920 | The North Saskatchewan Regiment |
| 10th Regiment, Canadian Mounted Rifles | 7 November 1914 | 17 July 1917 | The North Saskatchewan Regiment |
| 11th Regiment, Canadian Mounted Rifles | 7 November 1914 | 27 July 1918 | The British Columbia Dragoons |
| 12th Regiment, Canadian Mounted Rifles | 15 March 1915 | 5 April 1918 | The South Alberta Light Horse |
| 13th Regiment, Canadian Mounted Rifles | 15 March 1915 | 15 September 1917 | The South Alberta Light Horse |