| Jock Johnstone | |
| Fullname: | John Chalmers Johnstone |
| Height: | [1] |
| Position: | Right half |
| Birth Date: | 23 June 1898 |
| Birth Place: | Dundee, Scotland |
| Death Date: | [2] |
| Death Place: | Birmingham, England |
| Clubs1: | Dundee Hibernian |
| Years2: | 1919–1920 |
| Clubs2: | Montrose |
| Years3: | 1920–1922 |
| Caps3: | 13 |
| Goals3: | 1 |
| Years4: | 1922–1928 |
| Clubs4: | Aston Villa |
| Caps4: | 106 |
| Goals4: | 1 |
| Years5: | 1928–1929 |
| Clubs5: | Reading |
| Caps5: | 6 |
| Goals5: | 0 |
John Chalmers Johnstone (23 June 1898 – 3 November 1936) was a Scottish footballer who played for Dundee, Aston Villa and Reading, mainly as a right half.[3]
He played twice in Aston Villa's run to the 1924 FA Cup Final,[4] but did not take part in the match itself;[5] this was indicative of his struggles over several seasons to be selected ahead of Frank Moss and George Blackburn, both of whom were England internationals.