The following are the list of top engineering consultants ( consulting companies ) in Thailand :

• Bechtel Corporation ( Branch office) is a trusted engineering, construction and project management partner to industry and government.
• Arup architecture & consulting (officially Arup Group Limited) is a British multinational  professional services firm which provides engineering, architecture, design, planning , project management and consulting services for all aspects of the built environment. 
• ILF Consulting Engineers (ILF) is an international engineering and consulting firm that helps its clients successfully execute technically demanding industrial and infrastructure projects.
• Wood is a global leader in consulting and engineering across energy and the built environment.
• AFRY Consulting is a European leader in engineering, design, and advisory services, with a global reach.
• Atkins engineering is one of the world’s most respected design, engineering and project management consultancies.