John Benjamin Macneill | |
|---|---|
 | |
| Born | 1793 Dundalk, Ireland |
| Died | 2 March 1880 (aged 86–87) |
| Nationality | Irish |
| Occupation | Civil engineer |
Sir John Benjamin Macneill FRS (1793 – 2 March 1880) was an Irish civil engineer of the 19th century, closely associated with Thomas Telford. His most notable projects were railway schemes in Ireland.