The flag of Solomon Islands consists of a thin yellow diagonal stripe from the lower hoist-side corner, with a blue upper triangle and green lower triangle, and the canton charged with five white stars. Adopted in 1977 to replace the British Blue Ensign defaced with the arms of the protectorate, it has been the flag of Solomon Islands since 18 November of that year, eight months before the country gained independence. Although the number of provinces has since increased, the number of stars on the flag that originally represented them remained unchanged.

The British Solomon Islands Protectorate was first established in June 1893, when Captain Herbert Gibson of HMS Curacoa declared the southern Solomon Islands a British protectorate.