Succeeding James Harris who has become group managing director, Travers will be responsible for over 7,500 staff and revenue in excess of £824m.
She then joined Mott MacDonald in 1990 after the acquisition of her previous firm, Husband and Company, and has held several operational and business development roles.
Most recently she was managing director of the consultancy’s buildings and infrastructure business in the UK and Europe.
Mike Haigh, Mott MacDonald’s Group chairman, said: “I’m delighted that Cathy has been appointed managing director, UK and Europe – her experience is invaluable, and she has all the skills to do a brilliant job.”