The Green Ensign (Irish: An Meirge Uaine) is a historical flag flown by some Irish merchant vessels from the 17th century to the early 20th century.^[1] The flag consists of a green field with a golden Irish harp and a canton containing either St George's Cross or a version of the Union Jack.

This flag has appeared in these historical flag plates:

• 1685 Downman's Flag Chart
• 17th century A New Table of all the Ships, Collors or Ensings, in the Wholl Water World Newly Eneressed and Amende and all falts or Errors Corrected Never befor thytim brought to Light^[2]
• 1700 Len's Flag Chart
• c. 1700 Table des Pavillons quel on arbore dans toutes les Parties du Monde Connu (Peter Schenk the Elder)^[3]
• early 18th century: A new table of all the names of the principal parts and rigging of a man of war^[4]
• 1772 French Encyclopédie
• 1783 Bowles's Universal Display of the Naval Flags of all Nations
• 1799 Flags of all Nations
• 1848 Flaggen Aller Seefahrenden Nationen
• 1868 Johnson's new chart of national emblems
• 1889 Drawings of Flags of All Nations - British Admiralty
• 1917 National Geographic Flag Book

• 
  Sledge flag used in the Arctic by Henry Kellett during his 1852–1854 search for Franklin's lost expedition^[5]
• 
  Sledge flag used in Antarctica by Patrick Keohane during the Terra Nova Expedition (1910–1913)^[6]

• Blue Ensign
• Red Ensign
• White Ensign
• Green harp flag

• Green Ensign at FOTW site