William Smith (April 12, 1728 – March 27, 1814) was an American politician and representative of the fourth congressional district of Maryland in the United States House of Representatives.

Born on April 12, 1728, in the Province of Pennsylvania in what is now Donegal Township, Lancaster County, Smith moved to Baltimore, Maryland in 1761.

Appointed to the committee of correspondence in 1774 and to the committee of observation in 1775, Smith also served in the Revolutionary War as deputy adjutant general to Generals Horatio Gates and Nathanael Greene.

That same year, Smith was chosen as a Maryland delegate to the Continental Congress.

Smith was subsequently appointed as the first auditor of the United States Treasury, and served in that post from July 16, 1791, to November 27, 1791.