Allen was the author of several books, including the novel Peace River Country (1958) and Ordeal by Fire: Canada, 1910-1945 (1961), a history of Canada during the period of the two world wars. In 1967, Christina McCall edited a collection of Allen's newspaper and magazine columns entitled The Man From Oxbow.
Home Made Banners (Toronto, London, New York: Longmans, Green and Co., 1946), a novel about World War II
The Chartered Libertine (Toronto: Macmillan, 1954), a novel about the CBC
Peace River Country (Garden City, NY: Doubleday & Company, Inc., 1958), a novel about a family's search for a home in Canada's Peace River Country
Ordeal by Fire: Canada, 1910-1945 (Toronto: Doubleday Canada Limited, 1961), a history of Canada from World War I to World War II
Ask the Name of the Lion (Garden City, NY: Doubleday & Company, Inc., 1962), a novel about conflict in the Congo
The High White Forest (Garden City, NY: Doubleday & Company, Inc., 1964), a novel about Canadians in the Battle of the Bulge
The Man from Oxbow: The Best of Ralph Allen (Toronto, Montreal: McClelland and Stewart Limited, 1967), a collection of some of Allen's newspaper and magazine columns, edited with an introduction by Christina McCall Newman