The gleaming gold 75-storey Gevora Hotel stands 356 metres, or nearly a quarter of a mile, tall.
The new record-holder is within view of its predecessor, Dubai’s JW Mariott Marquis — just one metre shorter.
The Gevora’s first guests are expected on Monday, according to Emirati daily The National.
Dubai is also home to the world’s tallest building, the Burj Khalifa, which pierces the city skyline at 828 metres (half a mile) high.
The city-state, one of seven sheikhdoms that make up the energy-rich United Arab Emirates, aims to attract 20 million visitors annually by 2020 when it hosts the global trade fair Expo 2020.
The desert emirate boasts opulent shopping malls, numerous luxury resorts and even an indoor ski resort.
A major transit hub situated on transcontinental air routes, Dubai airport was the world’s busiest for international passengers in 2017 for the fourth year running, with 88.2 million travellers.