F. David Radler (born 1944 in Montreal, Quebec) is a Canadian executive and close associate of Conrad Black for 36 years. Radler was once president of Ravelston Corporation, a privately owned corporation owned by Black and Radler to control their former newspaper empire. Ravelston owned Argus Corporation which in turn controlled Chicago-based Hollinger International. In 2005 14.1% of Ravelston was owned by Radler.
Radler graduated from Queen's University in 1967 with a master's degree in Business Administration. In the 1980s Radler was in charge of the sale of Argus Corporation's Dominion supermarket chain to The Great Atlantic and Pacific Tea Company, or A&P. As well, Radler was once based in Chicago to help Black's media business—managed under Chicago-based Hollinger International) in the United States—as publisher of the Chicago Sun-Times newspaper and president and chief operating officer of Hollinger International.
After buying up the London Daily Telegraph, the Chicago Sun-Times, the Jerusalem Post, the Southam chain of Canadian newspapers and hundreds of small American newspapers, Hollinger International began to suffer from financial strain in the late 1990s. Radler and Black then sold off hundreds of their Canadian and American newspapers. Radler, who has lived in Vancouver, British Columbia, since the early 1970s, created a company called Horizon Publications Inc. This bought up some of the American newspapers owned by Hollinger International.
After controversy developed in 2003–2004 concerning $32,000,000 of 'non-compete' payments made to Black and Radler in the sale of Hollinger newspapers, the US Securities and Exchange Commission (and Canadian authorities as well) announced that Black and Radler were under investigation for their involvement.