Countries With Nearly Identical Flags

Indonesia and Monaco share what might be the closest resemblance of any two national flags: both are a simple horizontal red-over-white bicolor. The only formal difference is the ratio — Indonesia's flag is wider relative to its height than Monaco's — which is nearly impossible to spot unless the two are placed directly side by side.

Romania and Chad have a similar story with vertical tricolors of blue, yellow, and red. The shades differ slightly by official specification (Chad's blue leans a touch darker), but the difference is subtle enough that the two countries have occasionally raised diplomatic notes about flag confusion at international events.

Ireland and Ivory Coast take the same three colors — green, white, and orange — and simply mirror the order: green-white-orange for Ireland, orange-white-green for Ivory Coast. Because both are vertical tricolors of equal width, a flag flown upside down or mirrored can genuinely look like the other country's flag.

These coincidences usually come down to shared historical influences rather than direct copying — many 19th and 20th century independence movements drew on a small, popular set of tricolor and bicolor patterns, especially inspired by the French and Dutch flags, which is why so many later national flags echo similar structures.