The national flag of Anguilla, a British overseas territory, consists of a Blue Ensign with the British flag in the canton, charged with the coat of arms of Anguilla in the fly. The coat of arms consists of three dolphins, which were featured on the earlier Anguillan flag, and which stand for friendship, wisdom and strength.

The flag is Anguilla's third flag other than as part of Saint Christopher-Nevis-Anguilla. The island's first flag was a red flag featuring the name of the island in yellow and two mermaids inside a blue oval. Variants to this flag were also widely used, with some substituting red for purple and some not bearing the name of Anguilla. This flag was widely disliked and was replaced during Anguilla's brief period of independence by the Dolphin Flag, which is still widely seen around the island. This flag was a banner of the arms found on the current Blue Ensign, and was white with a broad blue band across the base of the flag, above which were three stylised golden dolphins.