Charles Frederick Henningsen (1815 – 14 June 1877) was a writer, mercenary, filibuster, and munitions expert.
He participated in civil wars and independence movements in Spain, Nicaragua, Hungary, and the United States.
He was born in Brussels.
His father was John Henningsen (1775–1859), a native of Copenhagen, Denmark, and his mother was Louisa Burke (1789–1842), an Irish heiress.
However, being adventurous in his youth, he revered Lord Byron in both literature and adventure, and so idealized British nobility in his actions.
The family lived in Brussels from at least the time of his birth until the onset of the Belgian Revolution, fleeing due to their pro-Dutch sympathies.
The family fled first to Paris, then to London.
One of his sisters was Josephine Amelie de Henningsen (1822–1904), a member of the Missionary Sisters of the Assumption, who established the order in South Africa in 1849.