Mosi-oa-Tunya (Tokaleya Tonga: the Smoke that Thunders) or Victoria falls, is a waterfall in southern Africa on the Zambezi River at the border of Zambia and Zimbabwe.

David Livingstone, the Scottish missionary and explorer, is believed to have been the first European to view Victoria Falls on 16 November 1855. He named his 'discovery' in honour of Queen Victoria of Britain, but the indigenous name, Mosi-oa-Tunya—"the smoke that thunders"—continues in common usage as well. The nearby national park in Zambia is named Mosi-oa-Tunya, whereas the national park and town on the Zimbabwean shore are both named Victoria Falls. The World Heritage List officially recognizes both names.

In 2013, the government of Zimbabwe declared its intention to officially rename the falls "Mosi-oa-Tunya", citing continuity with other renamings such as Harare (from Salisbury), and Zimbabwe (from Rhodesia).

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