Louis Ernest Lefaive (February 13, 1928 – July 4, 2002) was a Canadian sports administrator and civil servant. He served in multiple executive roles which included, the director of Fitness and Amateur Sport, director of Sport Canada, president of the National Sport Recreation Centre, president of the Canadian Paralympic Committee, chairman and president of Hockey Canada, executive director of the Canadian Figure Skating Association, and executive director of Sport Marketing Canada.

Lefaive was an original member of the Canada Games council, and was involved in planning the inaugural Arctic Winter Games. His involvement in Hockey Canada included negotiations for the 1972 Summit Series, the 1974 Summit Series, and the 1981 Canada Cup; and planning for the Canada men's national ice hockey team and the Canada men's national junior ice hockey team. He was described as "key builder of the Canadian sport system" by The Globe and Mail, and "had an exceptional ability to bring government and sport together, enabling the development of some of the most successful sports policies", according to the Canadian Paralympic Committee.

Lefaive was born on February 13, 1928, in Windsor, Ontario, the son of Achille and Aurore Lefaive. He played football, basketball and softball while growing up in Windsor. He attended University of Ottawa, then later coached basketball at the university and St. Patrick's College in Ottawa.

Lefaive was an original council member for the Canada Games that began in 1967, and was named a director of the Canadian Olympic Association.

Lefaive was appointed director of the Directorate of Fitness and Amateur Sport in 1968. He developed a working relationship with John Munro, the Minister of Health and Welfare, and was able to influence the government's policies on sport. Lefaive urged Munro to act on recommendations from the directorate before being tabled in the House of Commons of Canada. In 1968, Lefaive recommended that the directorate set national sport policies with the rationale it was staffed with full-time civil servants who were experts in physical education and public administration, instead of the National Advisory Council on Fitness who were volunteers. He later suggested the foundation of the Coaching Association of Canada.

On February 21, 1969, Hockey Canada began operations as a separate entity from the Canadian Amateur Hockey Association (CAHA), and Lefaive was appointed to the initial board of directors with the goal of the Canada men's national ice hockey team defeating the Soviet Union national ice hockey team, and assist in planning the upcoming 1970 Ice Hockey World Championships hosted in Canada. After a dispute with the International Ice Hockey Federation (IIHF) over Canada using professional players, Canada withdrew from international competition when Earl Dawson announced, "We will not return until the rules permit us to enter a team that is truly representative of Canadian hockey, so we can play our best players as all other countries do".

Lefaive was involved in planning the inaugural Arctic Winter Games in 1970. At the event's closing ceremonies he stated, "we're leaving behind a legacy of people who are, or have been, involved and certainly now committed to the positive values that flow from sports competition". He announced plans that the games would be held every two years.

The Directorate of Fitness and Amateur Sport was split into Sport Canada and Recreation Canada in 1971. Lefaive explained that Sport Canada would be concerned with the competitive aspects of sports, and Recreation Canada would be concerned with getting more Canadians to participate in sports for pleasure. He served as the director of Sport Canada until 1974.