Countries with similar flags include Chad and Romania, Indonesia and Monaco, and Australia and New Zealand. The flags of Chile, Liberia, Malaysia and the United States also are similar in design.
The flags of Chad and Romania are nearly identical, consisting of vertical blue, yellow and red stripes. Chad's flag uses a slightly darker shade of blue.
The flags of Indonesia and Monaco consist of two horizontal stripes of red and white. The only difference between the two flags is the official size, with the Monaco flag being closer to a square shape than rectangular.
The flags of Australia and New Zealand display the United Kingdom's Union Jack on a dark blue background and a similar pattern of stars, although the arrangement, number and color of stars differ.