Francis Joseph "Shag" Shaughnessy (April 8, 1883 – May 15, 1969) was an American athlete and sports executive. Shaughnessy played both baseball and football and was an executive in baseball, football and ice hockey. He was born in the United States and moved to Canada in the 1910s, where he was involved with football and ice hockey teams in Montreal and Ottawa. He was later president of the International League of baseball. His son Frank Shaughnessy Jr. also played football and ice hockey, and played ice hockey for the United States in the 1936 Winter Olympics.