The flag of Herm is white with a red St George's Cross with a banner of the arms of Herm in the canton; the arms are azure, between two dolphins argent a bend or bearing three cowled Benedictine monks sable. The ratio of the flag is 3:5. It was designed by the British vexillologist William Crampton. The arms of Herm was adopted in 1953. Around 1951 the island used a blue flag with the coat of arms of Guernsey near the hoist.Herm, Flags of the World.
See also List of flags of the United Kingdom Symbols of Normandy Flag of Guernsey
References
de:Flagge Guernseys#Flaggen der Inseln