Leo Cahill (July 30, 1928 – February 15, 2018) was an American head coach and general manager in the Canadian Football League (CFL), much of it spent with the Toronto Argonauts.

[2] Following his honourable discharge in 1953, Cahill returned to his alma mater, where he earned his master's degree and served as an assistant freshman football coach.

[3] After two seasons with the South Carolina Gamecocks, Cahill moved to the Canadian Football League in the 1960 as an assistant coach with the Montreal Alouettes.

[7] Following his dismissal, Cahill wrote a book, Goodbye Argos, with sportswriter Scott Young that was critical of the Argonauts organization, specifically the team's board of directors and general manager John Barrow, as well as his former boss in Montreal, Jim Trimble, and Hamilton Tiger-Cats president Ralph Sazio, who he accused of interfering with his getting the Alouettes head coaching job in 1973.

[9] Cahill and Bassett signed three of the Miami Dolphins top players – Larry Csonka, Jim Kiick, and Paul Warfield.

It was hoped that Cahill's hiring would help increase ticket sales for the struggling franchise and that as a media personality, he would be able to help with marketing as well as football operations.

Following bitter contract negotiations, Watts stated that he would not "let incompetent, insecure people like Leo Cahill hold the key to my future; I won't let a fool like that intimidate me" and returned to his hometown of Oklahoma City, where he owned highway construction company, worked public relations for a high school, and was youth director of his church.

[18] After leaving the Argonauts, Cahill worked as a leasing manager for Toronto auto firm, was a motivational speaker, and was a scouting consultant for the San Francisco 49ers.

[24] Leo Cahill died at an Atlanta hospital on February 15, 2018, at the age of 89, and is survived by five children: Steve, Christy, Terry, Lisa and Bettye.