The Victoria Falls or Mosi-oa-Tunya (the Smoke that Thunders) is a waterfall situated in southern Africa on the Zambezi River between the countries of Zambia and Zimbabwe. The falls are, by some measures, the largest waterfall in the world, as well as being among the most unusual in form, and having arguably the most diverse and easily seen wildlife of any major waterfall site.

Mosi-oa-Tunya is the name used by the local people and Victoria Falls is the later name given by Scottish explorer Dr. David Livingstone.

While it is neither the highest nor the widest waterfall in the world, the claim it is the largest is based on a width of 1.7 kilometers (1 mi) and height of 108 meters (360 ft), forming the largest sheet of falling water in the world. The falls' maximum flow rate compares well with that of other major waterfalls.

The unusual form of Victoria Falls enables virtually the whole width of the falls to be viewed face-on, at the same level as the top, from as close as 60 metres (200 ft), because the whole Zambezi River drops into a deep, narrow slotlike chasm, connected to a long series of gorges. Few other waterfalls allow such a close approach on foot.

Many of Africa's animals and birds can be seen in the immediate vicinity of Victoria Falls, and the continent's range of river fish is also well represented in the Zambezi, enabling wildlife viewing and sport fishing to be combined with sightseeing.

Victoria Falls are one of Africa's major tourist attractions, and are a UNESCO World Heritage Site. The falls are shared between Zambia and Zimbabwe, and each country has a national park to protect them and a town serving as a tourism centre: Mosi-oa-Tunya National Park and Livingstone in Zambia, and Victoria Falls National Park and the town of Victoria Falls in Zimbabwe.