Sir M MacDonald & Partners was a notable UK-based civil engineering consultancy during the 20th century. It was named after Sir Murdoch MacDonald, a Scottish-born civil engineer (and later a politician), and 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.