The annual Travelers' Choice Best of the Best Awards said Vietnam's capital has "aged well," preserving its cultural monuments and architecture while still making room for modern developments.
Rome was ranked the world's best food destination, while others in the region include Bangkok.
The Travelers' Choice Best of the Best Awards rank destinations around the world based on travelers' reviews over a 12-month period between November 1 and October 31.
Hanoi was ranked one of the world's 25 most popular destinations as part of the awards.