First Army (Ottoman Empire)
| First Army | |
|---|---|
| Active | September 6, 1843 August 5, 1914 – February 17, 1918 September 24, 1918 – October 11, 1918 |
| Country | Ottoman Empire |
| Type | Field Army |
| Garrison/HQ | Selimiye, Constantinople |
| Nickname(s) | Hassa Ordusu |
| Patron | Sultans of the Ottoman Empire |
The First Army or First Guards Army of the Ottoman Empire (Turkish: Birinci Ordu or Hassa Ordusu) was one of the field armies of the Ottoman Army. It was formed in the middle 19th century during Ottoman military reforms.