| 2/1st Welsh Border Mounted Brigade 17th Mounted Brigade 10th Cyclist Brigade 6th Cyclist Brigade | |
|---|---|
| Active | January 1915–1918 |
| Country |  United Kingdom |
| Branch |  British Army |
| Type | Yeomanry Bicycle infantry |
| Size | Brigade |
| Service | World War I |
The 17th Mounted Brigade previously known as the 2/1st Welsh Border Mounted Brigade was a 2nd Line yeomanry brigade of the British Army during the First World War. In July 1916 it was converted to a cyclist formation as 10th Cyclist Brigade and in November 1916 was redesignated as 6th Cyclist Brigade. It was still in existence, in Ireland, at the end of the war.