| 90th Regiment of Foot (Perthshire Volunteers) (Light Infantry) | |
|---|---|
&sq=&lang=&file=File:90th_Foot_Cap_Badge.jpg){kind=icon} Cap badge of the 90th Foot in the National Army Museum | |
| Active | 1794–1881 |
| Country |  Kingdom of Great Britain (1794–1800) United Kingdom (1801–1881) |
| Branch |  British Army |
| Type | Light Infantry |
| Size | One battalion (two battalions 1794–1795 and 1804–1817) |
| Garrison/HQ | Hamilton Barracks |
| Nickname(s) | "Perthshire Grey Breeks"[1] |
| Colours | Buff facings |
| Engagements | French Revolutionary Wars Napoleonic Wars Crimean War Sepoy Revolt Xhosa Wars Anglo-Zulu War |
| Commanders | |
| Notable commanders | Thomas Graham, Lord Lynedoch |
The 90th Perthshire Light Infantry was a Scottish light infantry regiment of the British Army, raised in 1794. Under the Childers Reforms it amalgamated with the 26th (Cameronian) Regiment of Foot to form the Cameronians (Scottish Rifles) in 1881.