Pedro de Garmendia (1794-1865) was briefly Governor of Tucumán Province in Argentina from December 1840 to January 1841 during a civil war between Unitarian and Federalist factions.

He was a member of the Tucumán House of Representatives that declared against the rule of Juan Manuel de Rosas, and was a minister of Governor Bernabé Piedrabuena.

[1] On 1 December 1840 the House of Representatives accepted Piedrabuena's resignation and appointed Pedro de Garmendia as his replacement.

On assuming office, Garmendia confirmed Dr. Marco Manuel de Avellaneda as his chief minister, a post he had held under Piedrabuena.

His letters written from exile are eloquent of his despair for the future of Argentina under Rosas, but he could see no prospect of removing the dictator.