Daniel Florence O'Leary (Irish: Dónall Fínín Ó Laoghaire; 14 February 1801 – 24 February 1854) was a military general and aide-de-camp under Simón Bolívar.

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Daniel Florence O'Leary
Bust of General O'Leary, Fitzgerald Park, Cork
Native name	Dónall Fínín Ó Laoghaire
Born	(1801-02-14)14 February 1801 Cork, Ireland
Died	24 February 1854(1854-02-24) (aged 53) Santa Fé de Bogotá, Colombia
Allegiance	Venezuelan republicans
Rank	Brigadier general
Battles/wars	Spanish American wars of independence Battle of Pantano de Vargas Battle of Boyacá Battle of Pichincha Battle of Portete de Tarqui

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O'Leary was born in Cork, Ireland; his father was Jeremiah O'Leary, a butter merchant. In 1817, Daniel O'Leary emigrated to South America.^[1]

Unlike many of the Irish who fought for Simon Bolívar in his many campaigns to win South American independence, O'Leary had not served in the Napoleonic Wars.

In 1827 he married Soledad Soublette, the younger sister of General Carlos Soublette, with whom he had nine children.

After Bolívar's death in 1830, O'Leary disobeyed orders to burn the general's personal documents. He spent much of the rest of his life organizing them, along with writing his own very extensive memoirs (spanning thirty-four volumes) of his time fighting in the revolutionary wars with Bolívar. He died in Bogotá, Colombia. He is buried in the National Pantheon of Venezuela.

A bust and plaque honouring O'Leary were presented by the Venezuelan Government to the people of Cork and unveiled on 12 May 2010 by the Venezuelan Ambassador to Ireland, Samuel Moncada.

• Irish military diaspora