Hearts of Oak may refer to:

• "Hearts of Oak", part of a quote spoken by Circe to Odysseus after his return from the underworld in the Odyssey
• "Heart of Oak", the official march of the Royal Navy (UK & Canada)
• Hearts of Oak (New York militia), a volunteer military unit formed during the American Revolutionary War
• Hearts of Oak (Ireland), a non-sectarian agrarian secret society on Ireland
• Hearts of Oak (play), an 1879 play by James Herne and David Belasco
• Hearts of Oak (film), a 1924 film directed by John Ford
• Hearts of Oak (album), an album by the band Ted Leo and the Pharmacists
• Accra Hearts of Oak SC, a football (soccer) club from Ghana
• "Hearts of Oak", a 32' sailing vessel which was the last boat built at Ulverston, Cumbria, in 1912. Currently owned by a Trust and totally restored, she is at Barrow-in-Furness and has a full sailing program in the local area.

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