The Mott MacDonald Group is a management, engineering and development consultancy headquartered in the United Kingdom. It employs +18,000 staff in 150 countries. Mott MacDonald is one of the largest employee-owned companies in the world

Mott MacDonald was formed in 1989 through the merger of Mott, Hay and Anderson and Sir M MacDonald & Partners.Mott, Hay and Anderson was a transportation engineering consultancy responsible for projects such as the London Underground while Sir M MacDonald & Partners was a water engineering consultancy with projects that included the Aswan Dam. The merger made Mott MacDonald one of the first international engineering, management, and development consultancies.