Old Buck may refer to:

• Nickname of James Buchanan (1791–1868), fifteenth president of the United States
• Nickname of Robert C. Buchanan (1811–1878), Union Army general during the American Civil War
• A Finnish malt whisky made by Panimoravintola Beer Hunter's
• Old Buck, a horse owned by Abraham Lincoln when he was a lawyer in Springfield, Illinois; see Old Bob, Old Buck's replacement

• Bedfordshire and Hertfordshire Regiment, a former British Army unit nicknamed "The Old Bucks"
• Buck (nickname)
• Histoire de Mr. Vieux Bois, a 19th century work published in English as The Adventures of Mr. Obadiah Oldbuck, sometimes referred to simply as Oldbuck

This disambiguation page lists articles associated with the title Old Buck.
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