(1922 – May 28, 2007) was the second and youngest daughter of James M. Cox, a Democratic Governor of Ohio, newspaper publisher and broadcaster. With her sister Anne Cox Chambers she inherited, via a trust, ownership and control of her father’s company, now called Cox Enterprises.

Her net worth was estimated at $12 billion, based principally on her equity interest in Cox Enterprises which made her one of the richest women in the United States and the richest resident of Hawaii.

She served as a Director of Cox Enterprises, one of the largest diversified media companies in the United States. It owns one of the nation's largest cable television businesses, which provides internet and telephone, publishes newspapers including the Atlanta Journal-Constitution and The Palm Beach Post, owns and operates broadcast television and radio stations and owns Manheim, an automobile auction firm. It also owns stakes in a variety of internet businesses, including AutoTrader.com, the largest retail automotive shopping site in the world. Her eldest son James Kennedy is CEO of Cox Enterprises.

In 2004 Cox Enterprises announced a debt financed $7.9 billion privatization bid for the 38% of the cable television business Cox Communications that it does not already own. With approximately 6.3 million cable subscribers Cox also provides high-speed Internet service to more than 2 million homes and telephone service to 1.1 million homes.

Well known in Hawaii for her support of philanthropic causes, she helped found La Pietra: Hawaii School for Girls and served as its Chair from 1978 until her death. She also made generous contributions to the Veterinary School of the Colorado State University, endowing two chairs in equine health.