Thomas Plater (May 9, 1769 – May 1, 1830) was an American lawyer and politician from Maryland.
His father, George Plater, served Maryland in the Continental Congress and governor.
He did follow his father's example in that he went to the College of William and Mary in Virginia and read law.
He made his home in Georgetown and held several local offices before being elected to the 7th Congress as a Federalist in 1800.
After Plater's congressional service he resumed the private practice of law.