| 5th Royal Irish Lancers | |
|---|---|
 Badge of the 5th (Royal Irish) Lancers | |
| Active | 1689–1799 1858–1922 |
| Country |  United Kingdom |
| Branch |  British Army |
| Type | Cavalry |
| Role | Line Cavalry |
| Size | 1 Regiment |
| Nickname(s) | The Redbreasts |
| Motto(s) | Quis separabit (Who shall separate us?) |
| March | Slow: Let Erin Remember, The Harp That Once Through Tara's Halls |
| Commanders | |
| Notable commanders | Field Marshal Richard Molesworth, 3rd Viscount Molesworth General Joseph Yorke, 1st Baron Dover |
The 5th Royal Irish Lancers was a cavalry regiment of the British Army. It saw service for three centuries, including the First World War. It amalgamated with the 16th The Queen's Lancers to become the 16th/5th Lancers in 1922.