Sir M MacDonald & Partners was a UK-based civil engineering consultancy during the 20th century, named after Sir Murdoch MacDonald, a Scottish-born civil engineer. Its establishment and early history was strongly associated with work in Egypt during the 1920s. In 1989, the company merged with Mott, Hay and Anderson to form Mott MacDonald, today a major international multidisciplinary consultancy.

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.