The flag of Andorra is based on the flags of France and Spain, the two states that protect the independence of the small state. The design of vertical bars is taken from the French Tricolore, as is the blue and red.

Yellow and red are taken from the Spanish and Catalan flags; from 1806 to 1866, Andorra's flag had been a horizontal bicolor of yellow and red. The motto in the coat of arms in the middle stripe Virtus Unita Fortior means "Strength United is Stronger".