| 86th (Royal County Down) Regiment of Foot | |
|---|---|
_Regiment_of_Foot&sq=Qlik&lang=&file=File:86th_Foot_colours.jpg) Regimental colours | |
| Active | 1793–1881 |
| Country |  Kingdom of Great Britain (1793–1800) United Kingdom of Great Britain and Ireland (1801–1881) |
| Branch |  British Army |
| Type | Infantry |
| Size | One battalion (two battalions 1813–1814) |
| Garrison/HQ | Victoria Barracks, Belfast |
| Engagements | French Revolutionary Wars Second Anglo-Maratha War Napoleonic Wars Indian Rebellion |
The 86th (Royal County Down) Regiment of Foot was an infantry regiment of the British Army, raised in 1793. Under the Childers Reforms it amalgamated with the 83rd (County of Dublin) Regiment of Foot to form the Royal Irish Rifles in 1881.