Ulloa, Antonio de, 1716-95, Spanish scientist and naval officer. As a young man he went to Peru with a scientific expedition, remaining in the country from 1736 to 1744; the result was an account of the people and the country published in 1748. The book was translated into English as A Voyage to South America (1758, 5th ed. 1807). Sent to New Orleans (1766) as governor of Louisiana after that province had been ceded by France to Spain, he was harassed in his administration by the rebellious attitude of the French colonists and by inadequate military and financial support. After an uprising in 1768 he was forced to leave.

Don Antonio de Ulloa may refer to:

• Antonio de Ulloa, a Spanish general, explorer, author, astronomer, and colonial administrator.
• Don Antonio de Ulloa, a Spanish Navy cruiser that fought at the Battle of Manila Bay during the Spanish-American War.