First Army

The military of a number of countries had or have a First Army:

• Australian First Army
• Austro-Hungarian First Army
• British First Army
• Bulgarian First Army
• Canadian First Army
• Republic of China First Army and New First Army
• French First Army
• German First Army
• Greek First Army
• Hungarian First Army
• Italian First Army
• Japanese First Army
• Ottoman First Army
• Polish First Army
• Romanian First Army
• Russian First Army
• Serbian First Army
• 1st Red Banner Army (Soviet Union)
• Turkish First Army
• First United States Army
• Yugoslavian First Army