Cheil Worldwide Inc.(KRX: 030000) is a marketing solutions company under the Samsung Group that offers advertising, public relations, shopper marketing, sports marketing, digital marketing, etc. It was established in 1973 with headquarters in Seoul, South Korea.

It is the country's largest and the world's 15th largest advertising agency, by 2013 revenues. Its major clients include Samsung, Hankook Tire, Deutsche Bahn, Orion, New Balance, Coca-Cola, AIG, ESPN, Emirates Integrated Telecommunications Company (du) and Dubai Electricity and Water Authority (DEWA).