20th Brigade may refer to:
Australia 20th Brigade (Australia)
India 20th Indian Brigade, a unit of the British Indian Army in World War I 20th Indian Infantry Brigade, a unit of the British Indian Army in World War II
Russia/Soviet Union 20th Guards Motor Rifle Brigade 20th Guards Rocket Brigade
South Korea 20th Armored Brigade (South Korea)
Ukraine 20th Unmanned Systems Brigade
United Kingdom 20th Light Armoured Brigade (United Kingdom) 20th Armoured Brigade (United Kingdom) 20th Brigade (United Kingdom) 20th Independent Infantry Brigade (Guards) 20th Mounted Brigade 20th Reserve Brigade Artillery units 20th Brigade, Royal Field Artillery XX Brigade, Royal Horse Artillery (T.F.)
United States 20th Aviation Brigade 20th Engineer Brigade (United States)
See also 20th Army (disambiguation) 20th Battalion (disambiguation) XX Corps (disambiguation) 20th Division (disambiguation) 20th Regiment (disambiguation) 20 Squadron (disambiguation)