The International Ice Hockey Federation (IIHF; French: Fédération internationale de hockey sur glace; German: Internationale Eishockey-Föderation) is a worldwide governing body for ice hockey. It is based in Zurich, Switzerland, and has 84 member countries.

The IIHF maintains the IIHF World Ranking based on international ice hockey tournaments. Rules of play for IIHF events differ from hockey in North America and the rules of the National Hockey League (NHL). Decisions of the IIHF can be appealed through the Court of Arbitration for Sport in Lausanne, Switzerland. The IIHF maintains its own hall of fame for international ice hockey. The IIHF Hall of Fame was founded in 1997, and has been located within the Hockey Hall of Fame since 1998.

Previously, the IIHF also managed the development of inline hockey; however, in June 2019, the IIHF announced that they would no longer govern inline hockey or organize the Inline Hockey World Championships.

The main functions of the IIHF are to govern, develop and organize hockey throughout the world. Another duty is to promote friendly relations among the member national associations and to operate in an organized manner for the good order of the sport. The federation may take the necessary measures in order to conduct itself and its affairs in accordance with its statutes, bylaws and regulations as well as in holding a clear jurisdiction with regards to ice hockey at the international level. The IIHF is the body responsible with arranging the sponsorships, license rights, advertising and merchandising in connection with all IIHF competitions.

Another purpose of the federation is to provide aid in the young players' development and in the development of coaches and game officials. On the other hand, all the events of IIHF are organized by the federation along with establishing and maintaining contact with any other sport federations or sport groups. The IIHF is responsible for processing the international players' transfers. It is also the body that presides over ice hockey at the Olympic Games as well as over all levels of the IIHF World Championships. The federation works in collaboration with local committees when organizing its 25 World Championships, at five different categories.

The IIHF is also responsible for the organization of European club competitions such as the Champions Hockey League or the Continental Cup.

The federation is governed by the legislative body of the IIHF which is the General Congress along with the executive body, which is the Council. The Congress is entitled to make decisions with regard to the game's rules, the statutes and bylaws in the name of the federation. It is also the body that elects the president and the council or otherwise known as board. The president of the IIHF is the representative of the federation. He represents the federation's interests in all external matters and he is also responsible that the decisions are made according to the federation's statutes and regulations. The president is assisted by the General Secretary, who is also the highest ranked employee of the IIHF.

The International Ice Hockey Federation was founded on 15 May 1908 at 34 Rue de Provence in Paris, France, as Ligue Internationale de Hockey sur Glace (LIHG). The 1920 Olympics were the first to integrate hockey into their program.