M&C Saatchi (: ) is an international advertising agency network formed in January 1995 by the brothers Maurice Saatchi and Charles Saatchi. This followed the resignation of Maurice Saatchi from the advertising agency group Saatchi & Saatchi which he had founded with his brother Charles in 1970. The company was originally called Dress Rehearsal, before changing its name in 1995. The Group's holding company M&C Saatchi PLC is listed on the AIM Board of the .
In December 1994 the Board of Saatchi & Saatchi PLC succumbed to sustained pressure from shareholder representative David Herro of Harris Associates L.P. and moved to remove its Chairman, Maurice Saatchi. Maurice subsequently resigned from his position. Within a month senior executives Jeremy Sinclair, Bill Muirhead, David Kershaw also resigned and decided to open their own agency. They were subsequently joined by Maurice and Charles Saatchi to create new business which would become known as M&C Saatchi. A number of Saatchi and Saatchi's London management and creative staff also joined some consequential clients would soon follow including Gallaher Group, Mirror Newspapers, the retailer Dixons and after a competitive pitch, British Airways and its part subsidiary Qantas as well as the Conservative Party, for whom they made the infamous New Labour, New Danger adverts.. In 2015, the agency was behind the Tory election campaign posters, picturing Ed Miliband in Alex Salmond's pocket.
A network was initially established in-line with the office locations required by British Airways and Qantas. By early 1996 the network consisted of offices in London, Singapore, Hong Kong, Sydney, New York and Auckland.