| Thomas Johnson-Smyth | |
| Birth Date: | 12 June 1857 |
| Birth Place: | Lisburn, Ireland |
| Death Place: | Natal, South Africa |
| Position: | Forward |
| Repyears1: | 1882 |
| Repcaps1: | 1 |
| Reppoints1: | 0 |
Thomas Roger Johnson-Smyth (12 June 1857 — 5 February 1900) was an Irish international rugby union player.
Born in Lisburn, Johnson-Smyth was a forward and gained his solitary Ireland cap against England at Lansdowne Road in 1882. He served as a captain with the Frontier Field Force in Sudan during the 1880s. In the Second Boer War, Johnson-Smyth was a major in the 1st Battalion of the Durham Light Infantry and was killed in the Battle of Vaal Krantz.[1] [2]