| Alexander Duncan | |
| Birth Date: | 1891 |
| Birth Place: | Glasgow, Scotland |
| Position: | Winger |
| Years1: | 1910–1911 |
| Clubs1: | Cambuslang |
| Years2: | 1911–1913 |
| Clubs2: | Portsmouth |
| Years3: | 1913 |
| Clubs3: | Grimsby Town |
| Caps3: | 2 |
| Goals3: | 0 |
Alexander L. Duncan (1891 – after 1912) was a Scottish professional footballer who played as a winger.[1]