Oriental Consultants Global Co., Ltd. (OC Global) is an international engineering and development consulting firm headquartered in Tokyo, Japan. The company was established in 2014 after being spun off from the global consulting division of Oriental Consultants Co., whose origins date back to 1957. OC Global provides professional consulting services for infrastructure development projects worldwide, including planning, feasibility studies, detailed design, construction supervision, and project management. The firm works with governments, international organizations, development banks, and private clients to deliver sustainable infrastructure and urban development solutions. 

The company specializes primarily in transportation and civil infrastructure projects, covering sectors such as roads, bridges, railways, metros, airports, ports, tunnels, and urban transport systems. In addition to transport infrastructure, OC Global also provides services in water supply and sewerage, water resources management, energy, environmental protection, disaster management, agriculture and rural development, architecture, and urban and regional planning. Its multidisciplinary teams support projects from early-stage studies and planning to construction supervision, asset management, and operational advisory services. 

OC Global operates globally and has implemented thousands of projects in more than 150 countries. The firm maintains an extensive international network with offices and subsidiaries across Asia, Africa, the Middle East, and other regions, including locations such as Manila, Jakarta, Bangkok, Colombo, Dhaka, Hanoi, and New Delhi. Through this global presence, the company contributes to the development of infrastructure and social systems that support economic growth, sustainable urbanization, and improved quality of life in developing and emerging economies.