| John Johnston | |
| Fullname: | John Ainslie Johnston |
| Position: | Centre half |
| Birth Date: | 17 November 1902 |
| Birth Place: | Stevenston, Scotland |
| Death Place: | Kilwinning, Scotland |
| Years1: | – |
| Years2: | 1921–1935 |
| Clubs2: | Heart of Midlothian |
| Caps2: | 274 |
| Goals2: | 9 |
| Years3: | 1922 |
| Clubs3: | → Stevenston United (loan) |
| Years4: | 1926 |
| Clubs4: | → Cowdenbeath (loan) |
| Caps4: | 10 |
| Goals4: | 0 |
| Years5: | 1935–1936 |
| Clubs5: | Arbroath |
| Caps5: | 8 |
| Goals5: | 0 |
| Totalcaps: | 292 |
| Totalgoals: | 9 |
| Nationalyears1: | 1928–1932[1] |
| Nationalteam1: | Scottish League XI |
| Nationalcaps1: | 3 |
| Nationalgoals1: | 0 |
| Nationalyears2: | 1929–1932[2] |
| Nationalteam2: | Scotland |
| Nationalcaps2: | 3 |
| Nationalgoals2: | 0 |
John Ainslie Johnston[3] (17 November 1902 – 12 October 1987) was a Scottish footballer who played as a centre-half[4] for Heart of Midlothian, where he spent 14 years[5] (as well as half-season loans at Stevenston United and Cowdenbeath and a short spell with Arbroath before retiring), and the Scotland national team.[6]