| Unit Name: | Otago Mounted Rifle Regiment |
| Dates: | 1911–1921 |
| Country: | New Zealand |
| Allegiance: | New Zealand Crown |
| Branch: | New Zealand Army |
| Role: | Mounted |
| Size: | Regiment |
| Command Structure: | New Zealand Mounted Rifles Brigade New Zealand Division |
| Notable Commanders: | Arthur Bauchop |
| Battles: | Great War |
The Otago Mounted Rifle Regiment was a New Zealand Mounted Regiment formed for service during World War I. It was formed from units of the Territorial Force consisting of the 5th Mounted Rifles (Otago Hussars), the 7th (Southland) Mounted Rifles and the 12th (Otago) Mounted Rifles.They saw service during the Battle of Gallipoli, with the New Zealand Mounted Rifles Brigade and was later withdrawn to Egypt. They later left the brigade and served in France with the New Zealand Division becoming the only New Zealand Mounted troops to serve in France.