| Taber, William | Silversmith | D 1835 |
| Taf, John James | Watchmaker | D 1794 |
| Tanguy, John | Jeweller | D 1801, 1805-1822 |
| Tanguy, John & Peter | Jewellers | D 1808 |
| Tanguy, Peter | Jeweller | D 1810-1819 |
| Tanguy, Repiton | Jeweller | D 1806 |
| Tanguy, see also Chevalier & Tanguy, Desquet & Tanguy, Pointe & Tanguy |
| Tanner, Benjamin | Engraver | D 1800 |
| Tappan, William B. | Clockmaker | D 1818-1819 |
| Tappan, see also Lemist & Tappan | | |
| Taylor, George W. | Silversmith | D 1823-1850 |
| Taylor, John G. | Jeweller | D 1837-1843 |
| Taylor, Luther | Watchmaker | D 1823-1835 |
| Taylor, Robert | Silversmith | D 1839-1850 |
| Taylor, Samuel | Watchmaker | D 1798-1799 |
| Taylor, William | Goldsmith | Adv. 1772-1778 |
| Taylor, William | Jeweller | D 1829-1833, 1849-1850 |
| Taylor & Gilpin | Jewellers | D 1843 |
| Taylor & Lawrie (or Lowrie) | Silversmiths | D 1837-1850 |
| Tempest, Robert | Goldsmith | D 1814-1816, d. 1816? |
| Tempest, Robert | Jeweller | D 1818-1850 |
| Tew, David | Engraver | D 1785 |
| Thibarult, see Thibault | | |
| Thibault, Felix | Jeweller | D 1814-1837 |
| Thibault, Francis | Goldsmith | D 1800-1802, d. 1802? |
| Thibault, Francis | Jeweller | D 1816-1831, 1846-1850 |
| Thibault, Francis & F. | Jewellers | D 1807-1809 |
| Thibault, Francis, Frederick & Felix | Jewellers | D 1813 |
| Thibault, Frederick | Goldsmith | D 1818-1835 |
| Thibault & Co. | Goldsmiths | D 1797-1798 |
| Thibault & Brothers | Jewellers | D 1810-1811, 1816-1835 |
| Thirion, Lewis | Jeweller | D 1828-1850 |
| Thirion & Hinkle | Jewellers | D 1850 |
| Thomas, Benjamin | Silverplater | D 1813, 1823-1850 |
| Thomas, Joseph | Jeweller | D 1805-1808 |
| Thomas, Richard | Silverplater | D 1802-1808 |
| Thompson, Henry | Watchmaker | D 1847-1850 |
| Thompson, Jeremiah | Silverplater | D 1840-1841 |
| Thompson, John P. | Watchmaker | D 1819, 1823-1824 |
| Thompson, Peter | Silversmith | D 1835-1850 |
| Thompson, Robert | Silvherplater | D 1840-1841 |
| Thomson, John L. | Jeweller | D 1849 |
| Thorn, John | Silverplater | D 1837 |
| Thornton, Andrew | Watchmaker | D 1811 |
| Thornton, John, Jr. | Silverplater | D 1825-1835, 1844-1847 |
| Thornton, Joseph | Watchmaker | D 1819 |
| Thran, see Trahn | | |
| Thum, Charles | Watchmaker | D 1828-1833 |
| Tibolt, see Thibault | | |
| Tierney, John | Watchmaker | D 1820-1824 |
| Titlow, J. | Silversmith | D 1844-1850 |
| Titlow & Fry | Silversmiths | D 1844-1847 |
| Tittle, Charles T. | Silversmith | D 1841-1847 |
| Titus, James | Watchmaker | D 1833 |
| Townsend, Charles | Watchmaker | D 1799-1850 |
| Townsend, Charles, Jr. | Watchmaker | D 1829-1850 |
| Townsend, Elisha | Watchmaker | D 1828-1829 |
| Townsend, John | Watchmaker | D 1849 |
| Townsend, John, Jr. | Watchmaker | D 1813-1833 |
| Townshend, see Townsend | | |
| Towson, Obadiah (or O. W.) | Silversmith | D 1819-1824 |
| Tracy, Charles | Watch Case Maker | D 1842-1850 |
| Tracy, C. & E. | Watch Case Makers | D 1847-1850 |
| Tracy, E. | Jeweller | D 1841-1842, 1846-1850 |
| Tracy, William | Watchmaker | D 1843-1850 |
| Trahn, Peter C. | Clockmaker | D 1843-1849 |
| Treadwell, Oren B. | Clockmaker | D 1847-1849 |
| Trenchard, James | Engraver | 1777, D 1785-1793 |
| Trenchard & Watson | Engravers | D 1800 |
| Trenson, John | Watch Case Maker | D 1817 |
| Troll, William | Goldsmith | D 1810-1811 |
| Trone, Peter | Clockmaker | D 1844 |
| Troth, William | Jeweller | D 1804-1808, 1813-1819 |
| Troth, William | Silverplater | D 1833-1835 |
| Trout, George | Silverplater | D 1837-1843 |
| Turner, James | Engraver | Adv. 1758 |
| Turner, William | Jeweller | D 1847-1850 |
| Tuthill, Christopher | Goldsmith | Adv. 1730 |
| Twelbib, M. | Jeweller | D 1828-1833 |
| Twybill, William | Jeweller | D 1841 |
| Tyson, Leech | Watchmaker | D 1823-1831 |
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