The International Professional Hockey League (IPHL) was the first fully professional ice hockey league, operating from 1904 to 1907. It was formed by Jack "Doc" Gibson, a dentist who played hockey throughout Ontario before settling in Houghton, Michigan. The IPHL was a five team circuit which included Pittsburgh, Pennsylvania, Sault Ste. Marie, Ontario, Sault Ste. Marie, Michigan, Calumet, Michigan and Houghton. The IPHL was instrumental in changing the nature of top-level senior men's ice hockey from amateur to professional.

Professional ice hockey (hockey) is the competition of ice hockey in which participants are paid to play. Professional competition began in North America in the United States—in Pennsylvania and Michigan—and in Canada around 1900. Professional ice hockey expanded across Canada and the United States and eventually to many other countries. There are major leagues around the world, including the National Hockey League in North America, the Kontinental Hockey League in Europe and Asia, and the Swedish Hockey League in Europe, as well as minor leagues such as the American Hockey League and ECHL in North America, and the Ligue Nord-Américaine de Hockey in Canada. High-level professional hockey is also present in Germany, the Czech Republic, Slovakia, Finland and Switzerland; professional hockey is also played in many other countries, as diverse as Ukraine, the United Kingdom, Austria, Australia and Japan. The major professional women's league is the Professional Women's Hockey League, which began play in 2024.