thumb|Man with St Lucian flag at a cricket match
The national flag of Saint Lucia consists of a cerulean blue field charged with a golden triangle in front of a white-edged black isosceles triangle. Adopted in 1967 to replace the British Blue Ensign defaced with the arms of the colony, it has been the flag of Saint Lucia since the country became an associated state of the United Kingdom that year. Although the overall design of the flag has remained unchanged, specific aspects of it have been altered over the years.
History
The French colonised Saint Lucia in 1635 and subsequently signed a treaty with the local indigenous population 25 years later in 1660. However, the British vied for control with the French, and the island frequently switched hands between the two powers. This continued until 1814, when the Treaty of Paris was signed that saw France permanently relinquish Saint Lucia to the British,
The British finally granted Saint Lucia its own unique coat of arms in August 1939. The escutcheon consisted of a black shield featuring two sticks of bamboo forming a cross, with two Tudor roses symbolising England and two fleurs-de-lis symbolising France occupying the four quadrants. This emblem was utilised to deface the British Blue Ensign in order to form the territory's flag. was adopted on that same day. When Saint Lucia became an independent country on 22 February 1979, the overall design of the flag from twelve years before remained unchanged, but the blue colour's shade and the triangles' sizes were modified marginally.
Design
thumb|right|A 1903 image of the [[Pitons (Saint Lucia)|Pitons, the two conical volcanic edifices that are stylised as the two central triangles of the flag.]]
The colours and symbols of the flag carry cultural, political, and regional meanings. The blue epitomises the sky and the sea, specifically the Atlantic Ocean and Caribbean Sea which encircle the country.