| Birth Date: | September 21, 1843 |
| Death Date: | 1904 |
| Alma Mater: | Georgetown University |
| Father: | Pedro Alcántara Herrán |
| Office: | Chargé d'affaires for Colombia in the United States |
| Term: | 1903 |
| Spouse: | Laura Echeverri Villa[1] |
Tomás Herrán y Mosquera (September 21, 1843[2] – 1904[3]), a Colombian diplomat, signed and became a namesake of the Hay–Herrán Treaty of 1903.[4]
Herrán was the son of Pedro Alcántara Herrán and the maternal grandson of Tomás Cipriano de Mosquera, who both served as President of Colombia.[5]
Herrán graduated from Georgetown University with a B.A. in 1863 and an M.A. in 1868. He was awarded a Doctor of Laws by Georgetown in 1900.[6]
At the time of the Hay–Herrán Treaty, Herrán served as Colombian chargé d'affaires in the United States of America. Herrán's papers were later published as The Letters of Tomás Herrán and the Panama Crisis, 1900–1903, edited by Thomas J. Dodd, Jr.[7]