Dentsu International (previously Dentsu Aegis Network) is a multinational media and digital marketing communications company headquartered in London, United Kingdom, and a wholly owned subsidiary of the Japanese advertising and public relations firm Dentsu. Its principal services are communications strategy through digital creative execution, media planning and buying, sports marketing and content creation, brand tracking and marketing analytics. It is organised into ten main divisions: Carat, Dentsu (operations outside Japan), Dentsu media, mcgarrybowen, Merkle, Fountainhead MKTG, Posterscope, Isobar, Soap Creative, iProspect and Vizeum. Dentsu Aegis Network manages all the Dentsu inc. owned businesses outside the Japan market, which includes the former Aegis Group business that it acquired in 2013. It also includes 360i, Amplifi, Amnet, BJL, Grip Limited, The StoryLab, Data2Decisions, Mitchell Communications, Cardinal Path and psLIVE. It has 35,000 people across 145 countries.

Aegis' origins date back to the founding of the media agency Centrale d'Achats Radio, Affichage, Télévision (Carat) in France in 1966. Formerly listed on the London Stock Exchange and a constituent of the FTSE 100 Index, Aegis was acquired by the Japan-based advertising group Dentsu in March 2013.