2nd Corps, Second Corps, or II Corps may refer to:
France 2nd Army Corps (France) II Cavalry Corps (Grande Armée), a cavalry unit of the Imperial French Army during the Napoleonic Wars II Corps (Grande Armée), a unit of the Imperial French army during the Napoleonic Wars
Germany II Cavalry Corps (German Empire), a unit of the Imperial German Army II Corps (German Empire), a unit of the Imperial German Army II Royal Bavarian Corps, a unit of the Bavarian Army and the Imperial German Army II Royal Bavarian Reserve Corps, a unit of the Bavarian Army and the Imperial German Army II Army Corps (Wehrmacht), a Wehrmacht unit in World War II II SS Panzer Corps, a Waffen-SS unit in World War II
Russian Empire 2nd Army Corps (Russian Empire) 2nd Siberian Army Corps 2nd Army Corps (Armed Forces of South Russia), a unit in the white movement
Soviet Union 2nd Airborne Corps (Soviet Union) 2nd Rifle Corps 2nd Guards Tank Corps
United States II Corps (United States), World War II II Corps (Union Army), a unit in the American Civil War Second Corps, Army of Northern Virginia Second Army Corps (Spanish–American War)
Other countries II ANZAC Corps, Australia and New Zealand II Corps (Australia) II Canadian Corps Second Artillery Corps, People's Republic of China Finnish II Corps (Winter War) Finnish II Corps (Continuation War) II Army Corps (Greece) II Corps (India) II Corps (North Korea) II Corps (Ottoman Empire) II Corps (Pakistan) II Corps (Poland) II Corps (South Korea) II Corps (South Vietnam) II Corps (United Kingdom) 2nd Corps (Vietnam People's Army) 2nd Army Corps (Azerbaijan) 2nd Army Corps (Armenia) 2nd Army Corps (Russia) (formerly the Luhansk People's Republic People's Militia, of Russian people's militias in Ukraine) 2nd Corps (Syria) 2nd Khartia Corps (Ukraine)
See also List of military corps by number