The following is a list of the tallest buildings in the world by country, listing only the tallest building in each country. The list includes only completed or topped-out buildings. 25 countries have supertall skyscrapers (above ) and 4 countries have megatall skyscrapers (above 600 m (1,969 ft)). Many countries constructed their tallest buildings in the 2010s, with the oldest being the Caracol temple in Belize, which has remained the country's tallest building since around 1200 BC.
The list includes the tallest completed or topped-out building in each country. Heights are measured to the architectural top, excluding antennas.
The list includes the tallest under construction buildings that will become their nation's tallest building upon completion.