Tranquilino de Bonilla y Herdocia (March 7, 1797 in San José, Costa Rica – April 1864 on the Pacific Ocean, near Esparza, Costa Rica) was a nineteenth-century Costa Rican politician. He came from Cartago. His parents are Félix de Bonilla y Pacheco and Rafaela Herdocia Fernández de la Pastora. He married Sinforosa de Peralta y López del Corral, the daughter of José María de Peralta y La Vega y Ana Benita Nava López del Corral.

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He held municipal posts in Cartago and attended the October 29, 1821 at the Carthage City Council meeting in which drafted the Declaration of Independence of Costa Rica, which was a signatory.

Supporter of the annexation of Costa Rica to the Mexican Empire . As a monarchist officer, he participated in the Battle of Ochomogo on 5 April 1823.