Théobald-René, Comte de Kergariou-Locmaria (17 September 1739 – 16 July 1795) was a French Navy officer and Royalist émigré.
Kergariou-Locmaria was born on 17 September 1739 at Coatilliau Castle, near Lannion, in a family of old nobility. He was brother to Jonathas de Kergariou-Locmaria, to Pierre-Joseph de Kergariou-Rosconnet and to Raymond-Marie de Kergariou-Coatlès.
Kergariou-Locmaria joined the Navy in the Gardes de la Marine in 1755, and served on the 50-gun Aigle, under Captain de Saint-Alouarn, in a fleet bound for Saint-Domingue and commanded by Périer.
Promoted to Ensign on 17 April 1757, he was appointed to command the batteries of the coastal defences of Saint-Domingue. He served at sea from 1758 to 1770, appointed first on Amphion and taking part in the Siege of Louisbourg, and from 1759 on Sardine.
He then served on Orient, on which he took part in the Battle of Quiberon Bay on 20 November 1759. He later served as an officer on the frigates Hébé, from 1760, and Licorne, from 1762. In Licorne, he took part in the raids against British establishments on Newfoundland, under Admiral de Ternay.
After Ternay's expedition, Kergariou-Locmaria returned to the Caribbean, serving on the frigate Comète from 1763, the 80-gun Saint-Esprit from 1764, the fluyt Balance in 1766 and eventually the frigate Belle-Poule from 1769.
In February 1770, Kergariou-Locmaria was promoted to Lieutenant. In 1772, he took part in a campaign in the Indian Ocean on Belle-Poule, before taking command of the fluyt Esturgeon in 1773. In 1774, he was appointed to command the 14-gun corvette Serin, on which he patrolled and captured several British slave ships. In 1775, Kergariou-Locmaria was made a Knight in the Order of Saint-Louis.