| Josiah Smith | |
| State1: | Massachusetts |
| Term Start1: | March 4, 1801 |
| Term End1: | March 3, 1803 |
| Succeeded1: | Samuel Taggart |
| Office2: | Member of the Massachusetts Senate |
| Term2: | 1792-1794 1797 |
| Office3: | Member of the Massachusetts House of Representatives |
| Term3: | 1789-1790 |
| Birth Date: | 26 February 1738 |
| Birth Place: | Pembroke, Province of Massachusetts Bay, British America |
| Death Place: | Pembroke, Massachusetts, U.S. |
| Restingplace: | Pembroke Cemetery |
| Party: | Democratic-Republican |
| Children: | Albert Smith |
| Alma Mater: | Harvard College, 1774 |
| Profession: | Attorney |
Josiah Smith (February 26, 1738 – April 4, 1803) was a United States representative from Massachusetts. Born in Pembroke in the Province of Massachusetts Bay, to Reverend Thomas Smith and Judith Miller Smith. Smith graduated from Harvard College in 1774, studied law, was admitted to the bar and practiced.
Smith was elected as a Democratic-Republican to the Seventh Congress, serving from March 4, 1801 to March 3, 1803. He was not a candidate for renomination in 1802.
On his way home from Washington, Smith contracted smallpox in New York, he died in Pembroke. Smith was interred in Center Cemetery, Pembroke, Massachusetts.