1st Army Corps

1st Army Corps may refer to:

• I Army Corps (Greece)
• I Army Corps (Wehrmacht)
• I Corps (British India)
• I Corps (India)
• I Corps (Polish Armed Forces in the West)
• I Corps (Sri Lanka)
• I Corps (United Kingdom)
• I Corps (United States)
• 1st Army Corps (France)
• 1st Army Corps (Russian Empire)
• 1st Army Corps (Soviet Union)
• 1st Army Corps (Armed Forces of South Russia)
• 1st Army Corps (Azerbaijan)
• 1st Army Corps (Armenia)
• 1st Army Corps (Russia) (formerly the Donetsk People's Republic People's Militia, of Russian separatist forces in Donbas)