American lawyer and public official who served in both domestic and international capacities in the administrations of two U.S. presidents.

Hills attended Stanford (California) University (B.A., 1955) and Yale Law School (LL.D., 1958). After her admission to the California bar in 1959, she worked for two years as an assistant United States attorney in Los Angeles. In 1962 she cofounded and was a partner at the law firm of Munger, Tolles, Hills, & Rickershauser, where she gained experience in antitrust and securities cases (1962–74). She also was president of the Los Angeles chapter of the Federal Bar Association (1963) and of the National Association of Women Lawyers (1965). She was admitted to the bar of the U.S. Supreme Court in 1965.

In 1974 Hills became assistant attorney general in charge of the Justice Department's civil division. The following year she became the third woman to hold a U.S. cabinet post when President Gerald Ford appointed her secretary of the Department of Housing and Urban Development (1975–77). In 1978 Hills opened a Washington, D.C., branch of the Los Angeles law firm Latham & Watkins and remained there until 1986, when she became a partner with Weil, Gotshal, & Manges. In 1989 President George Bush appointed her U.S. trade representative; in this position she focused on breaking down Japanese trade barriers and urging the European Community to phase out farm subsidies, which undercut American farmers. In 1993 she founded a consulting firm, Hills & Company, and cofounded the Forum for International Policy. She also served on the boards of many large corporations.