Justin-Bonaventure Morard de Galles (30 March 1741, Goncelin, Isère – 23 July 1809, Guéret) was a French admiral.
de Galles was the issue of a noble family from Dauphiné whose origins stretched right back to the end of the 11th century. His father was an infantry captain, and his elder brother Charles Morard de La Bayette de Galles was a général de Division under the Revolution and the Directory.
On 22 December 1783 he married Louise Marie Victoire Henriette Fayd'herbe de Maudave at Port-Louis, Mauritius. To this day there are many descendants of her siblings still living in Mauritius
de Galles began his naval career in 1757 on the brig Ecureuil and took part in many combats in the Mediterranean and the Americas as part of the Royal French Navy with the rank of garde de pavillon. He entered the service at the age of 11, in the gardes de la maison du roi.
In 1765, the comte de Grasse was charged with clearing the Mediterranean of its infestation of Barbary pirates. In 1765, on Héroïne as enseigne de vaisseau, Morard de Galles participated in the bombardment of Morocco's Atlantic coast. The young Morard de Galles next became an ensign on board the frigate Hermine, and there received a mission to burn one of the corsairs which had taken refuge under the protection of the coastal batteries. Favoured by a cloudy night, he board the enemy vessel and attached a coat of sulphur to one of her sides - a terrible explosion half an hour later announced the success of this audacious enterprise.
Returning to France, he remained attached to the group directing the naval building works at Brest until 1776, when he took to sea again in Duchaffault's squadron. Named lieutenant de vaisseau in 1777, he distinguished himself the following year at the Battle of Ushant on board the Ville de Paris, and in the encounters of 17 April, 15 and 19 May 1780.