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- 1st Independent Division of Zhejiang Provincial Military District (2nd Formation)
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- 1st Infantry Division "Superga"
- 1st Infantry Division (Azerbaijan, 1918)
- 1st Infantry Division (Belgium)
- 1st Infantry Division (France)
- 1st Infantry Division (Greece)
- 1st Infantry Division (Independent State of Croatia)
- 1st Infantry Division (Philippines)
- 1st Infantry Division (Republic of Korea)
- 1st Infantry Division (Romania)
- 1st Infantry Division (Russian Empire)
- 1st Infantry Division (Slovak Republic)
- 1st Infantry Division (South Africa)
- 1st Infantry Division (United Kingdom)
- 1st Infantry Division (United States)
- 1st Infantry Division (Wehrmacht)
- 1st Infantry Division Artillery (United States)
- 1st Infantry Division Museum
- 1st Infantry Division Superga
- 1st Infantry Regiment "San Giusto"
- 1st Infantry Regiment (Estonia)
- 1st Infantry Regiment (France)
- 1st Infantry Regiment (Greece)
- 1st Infantry Regiment (Lithuania)
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- 1st Infantry Regiment (United States)
- 1st Information Operations Command (Land)
- 1st Intelligence, Surveillance, and Reconnaissance Brigade
- 1st Intelligence Battalion
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- 1st Interceptor and Strike Fighter Squadron (Brazil)
- 1st Inverness Artillery Volunteers
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- 1st Laotian Parachute Battalion
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- 1st Legion Tercio "Great Captain Gonzalo Fernández de Córdoba"
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- 1st Light Cavalry Division (France)