Senator Johnston
- Archibald Johnstone
- Bertie Johnston
- David Emmons Johnston
- David Johnston (Australian politician)
- George Doherty Johnston
- Harry Johnston (American politician)
- Henry S. Johnston
- J. Bennett Johnston
- J. Mark Johnston
- James Johnston (Colonel)
- James Johnston (Northern Ireland politician)
- John Frederick Johnston
- John Stewart Johnston
- John W. Johnston
- Joseph F. Johnston
- Josiah S. Johnston
- Mike Johnston (Colorado politician)
- Olin D. Johnston
- Patrick Johnston (American politician)
- Rienzi Melville Johnston
- Rod Johnston
- Samuel Johnston
- Senator Johnson (disambiguation)
- Thomas D. Johnston
- W. Broughton Johnston
- William Agnew Johnston
- William Ernest George Johnston