3rd Brigade may refer to:
Australia 3rd Army Tank Brigade (Australia) 3rd Brigade (Australia) 3rd Light Horse Brigade 3rd Motor Brigade (Australia)
Belarus 3rd Separate Special-Purpose Brigade
British India 3rd (Abbottabad) Brigade 3rd (Ambala) Cavalry Brigade 3rd (Meerut) Cavalry Brigade 3rd Indian Brigade
Canada 3rd Canadian Infantry Brigade
China 3rd Air Defense Composite Brigade (People's Republic of China) 3rd Armored Brigade (People's Republic of China) 3rd Motorized Infantry Brigade (People's Republic of China)
Croatia 3rd Guards Brigade (Croatia)
France 3rd Light Armoured Brigade (France)
Georgia 3rd Infantry Brigade (Georgia)
Germany 3rd Cavalry Brigade (Germany) 3rd Estonian SS Volunteer Brigade 3rd Panzer Brigade (Bundeswehr) 3rd Panzer Brigade (Wehrmacht)
Greece 3rd Greek Mountain Brigade 3rd Mechanized Infantry Brigade (Greece)
India 3rd (Ambala) Cavalry Brigade 3rd (Meerut) Cavalry Brigade 3rd Indian Infantry Brigade 3rd Indian Motor Brigade
Iran 3rd Ansar-ol-Hojjat Brigade 3rd Imam Hossein Brigade 3rd Marine Brigade (Iran)
Ireland 3rd Cork Brigade 3rd Tipperary Brigade
Israel Alexandroni Brigade
Italy 3rd Mechanized Brigade "Goito" 3rd Missile Brigade "Aquileia"
Japan 3rd Cavalry Brigade (Imperial Japanese Army)
Lebanon 3rd Infantry Brigade (Lebanon)
Lithuania 3rd Lithuanian National Cavalry Brigade
Moldova 3rd Motorized Infantry Brigade "Dacia"
Poland 3rd Brigade, Polish Legions 3rd Polish Infantry Brigade 3rd Mountain Brigade (Poland)
Russia 3rd Guards Spetsnaz Brigade
Serbia 3rd Army Brigade
South Africa 3rd Field Brigade (THA) 3rd Infantry Brigade (South Africa)
South Korea 3rd Armored Brigade (South Korea)
Spain 3rd Mixed Brigade
Sweden 3rd Coastal Artillery Brigade
Turkey 3rd Commando Brigade (Turkey)
Ukraine 3rd Assault Brigade 3rd Communication Brigade (Ukraine) 3rd Heavy Mechanized Brigade 3rd Operational Brigade (Ukraine) 3rd Trans-Dnepr Brigade
United Kingdom 3rd Anti-Aircraft Brigade (United Kingdom) 3rd Armoured Brigade (United Kingdom) 3rd Cavalry Brigade (United Kingdom) 3 Commando Brigade (United Kingdom) 3rd Deep Recce Strike Brigade 3rd Guards Brigade (United Kingdom) 3rd Infantry Brigade (United Kingdom) 3rd Mounted Brigade (United Kingdom) 3rd (Nottinghamshire and Derbyshire) Mounted Brigade 3rd Parachute Brigade (United Kingdom) 3rd Provisional Brigade (United Kingdom) 3rd Reserve Brigade 3rd (Royal Marine) Brigade Artillery units 3rd Brigade, Royal Field Artillery 3rd Brigade, Cinque Ports Division, Royal Artillery 3rd Brigade, Eastern Division, Royal Artillery 3rd Brigade, Northern Division, Royal Artillery 3rd Brigade, North Irish Division, Royal Artillery 3rd Brigade, Scottish Division, Royal Artillery 3rd Brigade, Welsh Division, Royal Artillery 3rd Brigade, Western Division, Royal Artillery 3rd (Duke of Connaught's Own) Brigade, Southern Division, Royal Artillery 3rd County of London Brigade Royal Field Artillery 3rd East Lancashire Brigade (The Bolton Artillery), Royal Field Artillery 3rd Home Counties (Cinque Ports) Brigade, Royal Field Artillery 3rd Lowland Brigade, Royal Field Artillery 3rd Highland Brigade, Royal Field Artillery 3rd (Northumbrian) Medium Brigade, Royal Garrison Artillery 3rd Northumbrian (County of Durham) Brigade, Royal Field Artillery 3rd North Midland Brigade, Royal Field Artillery 3rd South Midland Brigade, Royal Field Artillery 3rd Welsh Brigade, Royal Field Artillery 3rd Wessex Brigade, Royal Field Artillery 3rd West Riding Brigade, Royal Field Artillery 3rd Volunteer (Hampshire) Brigade, Southern Division, Royal Artillery III Brigade, Royal Horse Artillery III Brigade, Royal Horse Artillery (T.F.)
United States 3rd Brigade, 7th Infantry Division (United States) 3rd Brigade, 24th Infantry Division (United States) 3rd Brigade, 104th Division (United States) 3rd Chemical Brigade (United States) 3rd Infantry Brigade, 2nd Infantry Division 3rd Maneuver Enhancement Brigade 3rd Marine Expeditionary Brigade 3rd Reserve Officers' Training Corps Brigade 3rd Security Force Assistance Brigade 3rd Signal Brigade (United States) 3rd Support Brigade 3rd Sustainment Brigade (United States) 3rd Transportation Brigade (Expeditionary) Brigade Combat Teams 3rd Brigade Combat Team, 1st Armored Division 3rd Brigade Combat Team, 1st Infantry Division (United States) 3rd Brigade Combat Team, 1st Cavalry Division 3rd Brigade Combat Team, 2nd Infantry Division (United States) 3rd Brigade Combat Team, 10th Mountain Division 3rd Brigade Combat Team, 25th Infantry Division (United States) 3rd Brigade Combat Team, 82nd Airborne Division 3rd Brigade Combat Team, 101st Airborne Division (United States)
See also 3rd Division (disambiguation) 3rd Regiment (disambiguation)