One Bangkok is a US$3.9 billion mixed-use development under construction in Bangkok, Thailand. One Bangkok is being developed by Frasers Property, a subsidiary of TCC Group, one of Thailand's largest conglomerates. It was expected to open in stages between 2024 and 2027 but due to delays has commenced opening in 18 March 2024 starting with the first office building and other elements expected to open during 2024 onwards.

The One Bangkok site occupies an area of 16.7 hectares (41 acres) overlooking Lumphini Park at the corner of Rama IV Road and Witthayu Road in Pathum Wan district. The site was previously Suan Lum Night Bazaar and encompasses the old Lumpinee Boxing Stadium and the old Armed Forces Academies Preparatory School.

The development comprises five office towers, three hotels/service apartment towers, interconnected retail podiums, art and cultural venues, with 8 hectares of plazas and landscaped green spaces. The project incorporated many sustainability design features such as a centralised energy and water management system, and the use of recycled waste building materials in construction. It is the first project in Thailand to target a LEED Platinum for neighbourhood development. The development will be directly linked to the Lumphini MRT station via underground basement and tunnels.

One Bangkok is the first real estate project in Thailand to receive both Platinum certifications for WiredScore and SmartScore, marking the highest level of recognition from WiredScore for its commercial office towers.

Among the prominent firms that have chosen to establish their offices at One Bangkok are Baker McKenzie Ltd., KGI Securities (Thailand) Public Company Limited, Estee Lauder Companies, A. Menarini (Thailand) Ltd., LINE MAN Wongnai, and BMW Group Thailand, among others.

One Bangkok is planned as an integrated district that will accommodate a living and working population of 60,000, and up to 200,000 daily visitors.

The project includes five Grade-A office towers ranging between 40 and 92 storeys, three luxury hotels and service apartment towers and four retail precincts with a combined gross floor area of 1.83 million square metres. The retail precinct will accommodate 450 stores with 180,000 square metres of net lettable area.

Two hotels are currently announced for One Bangkok: The Ritz-Carlton Bangkok, occupying the first 25 floors of one 50-storey tower, and Andaz One Bangkok, occupying the adjacent hotel tower. Both hotels are slated to open at the end of 2024.

The tallest building was originally planned within the complex to be the 92-storey Signature Tower, which at 436 metres (1,430 feet) in height would become Bangkok's and Thailand's tallest building upon completion. As of 2024, construction of the superstructure works of the signature tower and one residential tower do not appear to have started, much of the rest of the development is now topped off or close to complete with first office building opening to public in March 2024.

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  Groundworks of One Bangkok in 2020
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  Andaz One Bangkok
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  One Bangkok Forum
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  One Bangkok Tower 3
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  One Bangkok Tower 4
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  One Bangkok Towers 4 and 3 (left and right)
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  One Bangkok Tower 5
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  Pathom House
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  Billboards on Parade retail building
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  Shops in Parade
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  The Ritz-Carlton, Bangkok

• Official website
• Frasers Property Information Page

13°43′38″N 100°32′50″E / 13.7272°N 100.5473°E / 13.7272; 100.5473