| Loftus Armstrong | |
| Birth Name: | Adam Loftus Armstrong |
| Birth Date: | 13 April 1878 |
| Birth Place: | Carterton, New Zealand |
| Death Place: | Hastings, New Zealand |
| Ru Position: | Wing-forward |
| Weight: | 93kg (205lb) |
| Repyears1: | 1903 |
| Repcaps1: | 0 |
| Reppoints1: | 0 |
| Ru Province1: | Wairarapa |
| Ru Provinceyears1: | 1899–1905 |
| Ru Provinceapps1: | 33 |
| Occupation: | Blacksmith |
Adam Loftus Armstrong (13 April 1878 – 30 January 1959) was a New Zealand rugby union player. A wing-forward, Armstrong represented Wairarapa at a provincial level, and was a member of the New Zealand national side, the All Blacks, in 1903. He played five matches for the All Blacks but did not appear in any internationals. After retiring as a player, Armstrong went on to referee to provincial level.[1]
Following the death of Donald Watson in 1958, Armstrong was the oldest living All Black.