Tokyo Skytree is a broadcasting and observation tower in Sumida, Tokyo. It became the tallest tower in Japan in 2010 and reached its full height of 634 meters (2,080 ft) in March 2011, making it the tallest tower in the world, displacing the Canton Tower, and the third tallest structure in the world after Merdeka 118 and the Burj Khalifa. It is the tallest freestanding tower in the OECD, the G20 and G7 countries.

A tower is a tall structure, taller than it is wide, often by a significant factor. Towers are distinguished from masts by their lack of guy-wires and are therefore, along with tall buildings, self-supporting structures.