Patricia "Tricia" Nixon Cox (born February 21, 1946, in Whittier, California) is the first daughter of the 37th U.S. president Richard M. Nixon and his wife, Patricia Ryan Nixon.

As opposed to her younger sister, Julie Nixon Eisenhower, Cox performed more of a ceremonial role during her father's political career, accompanying him to many campaign stops and, after his presidential inauguration, state trips around the world.

Cox attended Finch College in Manhattan, New York, a since-closed women's college best known as a "finishing school" for affluent young women. At her graduation on June 14, 1968, her father served as a special guest speaker.