Thomas Lowndes (January 22, 1766 – July 8, 1843) was an American planter, lawyer and politician from Charleston, South Carolina.

He was the son of Rawlins Lowndes, governor of South Carolina during the American Revolutionary War and half-brother of William Lowndes (congressman), who helped secure the declaration of the War of 1812.

Educated in Charleston, he studied law there and became a practicing lawyer in the city in the late 18th century.

He failed to win back his seat in 1808, and retired from public life thereafter.

This article about a South Carolina politician is a stub.