Here are the Battle Honours awarded to the 20th (XHX) those highlighted are linked to those campaigns.

• Early wars:
  Vimiera
  Peninsula
  Suakin 1885
  South Africa 1901 – 1902 (Ladysmith and Boar War)
  
  
• The Great War:
  Mons
  Retreat from Mons
  Marne 1914
  Aisne 1914
  Messines 1914
  Ypres 1914 – 1915
  Neuve Chapelle
  St. Julien
  Bellewaarde
  Arras 1917
  Scarpe 1917
  Cambrai 1917 – 1918
  Somme 1918
  St. Quentin
  Lys
  Hazebrouck
  Amiens
  Albert 1918
  Bapaume 1918
  Hindenburg Line
  St. Quentin Canal
  Beaurevoir
  Sambre
  France and Flanders 1914 – 1918