Gladys Mills Phipps was an American socialite, sportsperson, and a thoroughbred racehorse owner and breeder who began the Phipps family dynasty in American horse racing. She was known as the "first lady of the turf".

The Phipps family of the United States is a prominent American family that descends from Henry Phipps Jr. (1839–1930), a businessman and philanthropist. His father was an English shoemaker who immigrated in the early part of the 19th century to Philadelphia, Pennsylvania, before settling in Pittsburgh. Phipps grew up with Andrew Carnegie as a friend and neighbor. As an adult, he was Carnegie's business partner in the Carnegie Steel Company and became a very wealthy man. He was the company's second-largest shareholder and also invested in real estate.