Notable works:
* The History of Napoleon Bonaparte (1972): A critically acclaimed biography of Napoleon, considered a definitive work on the subject.
* The Reign of Louis XIV (1972): A comprehensive and detailed account of the reign of the Sun King.
* A History of the Scots (1995): An exploration of Scottish history from its beginnings to the 20th century.
* The Royal Court of Louis XIV (1981): A captivating exploration of the politics, culture, and personalities of the French court.
* The Life of Leonardo da Vinci (1989): A biography exploring the life and works of the Renaissance master.
Other notable works:
* The Anglo-Irish Wars 1169-1216 (1967)
* The Wars of the Roses (1967)
* The Military History of the British Isles (1968)
* The Companion Guide to Paris (1981)
* The Life of Henry VIII (1982)
* The Life of Mary Queen of Scots (1983)
* The Companion Guide to Rome (1984)
* The Companion Guide to Venice (1987)
* A History of England: From the Dark Ages to the Present Day (1991)
Cronin's works are known for their accessibility, engaging narratives, and insightful interpretations. He is regarded as one of the most successful popular historians of his generation.