Thomas Colt Fanning (August 2, 1805 - November 21, 1873) was a New York based map publisher active in the middle part of the 19th century. Fanning was born in Norwich, Connecticut. As a young man he apprenticed at a drugstore in Rochester, New York. When he reached his maturity, he relocated to Albion, New York, where he opened the town's first drugstore. He sold this business in 1849 to move to Brooklyn and enter the map publishing business. He initially partnered with Humphrey Phelps (1799 - 1875) and Thomas C. Fanning (1805 - 1873), joining the firm of 'Phelps and Fanning' as a junior partner. From 1854 to 1863 he partnered with Edward H. Ensign (1818 - 1871) and Erastus Clark Bridgman (1817 - 1870), publishing as 'Ensign, Bridgman and Fanning.'