The national flag of The Gambia consists of three horizontal red, blue and green bands separated by two thin white stripes. Adopted in 1965 to replace the British Blue Ensign defaced with the arms of the Gambia Colony and Protectorate, it has been the flag of the Republic of the Gambia since the country gained independence that year. It remained unchanged throughout the Gambia's seven-year confederation with Senegal.

The British first arrived in what is now modern-day Gambia in 1661, when they conquered James Island. They built forts around the confluence of the Gambia River with the Atlantic Ocean, and gradually expanded their control upstream. This area became a protectorate in the 1820s under the jurisdiction of Sierra Leone, and eventually emerged as a separate crown colony of the United Kingdom within its colonial empire in 1888. This newfound status gave the Gambia its own "distinctive" colonial flag. This is because colonies were permitted to utilize the British Blue Ensign and deface it with the arms of the territory under the Colonial Naval Defence Act 1865. The arms of the Gambia at the time consisted of a circle depicting an elephant, a palm tree and hills, along with the letter "G" standing for the first letter of the territory's name. Wikipedia