John Janney | |
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| Member of the Virginia House of Delegates from Loudoun County | |
| In office 1834 – 1835 or 1845 | |
| Delegate to the Virginia Constitutional Convention of 1850 from Loudoun County | |
| In office October 14, 1850 – October 25, 1851 | |
| Presiding officer of the Virginia Secession Convention of 1861 and Delegate from Loudoun County | |
| In office February 13, 1861 – May 23, 1861 | |
| Personal details | |
| Born | November 8, 1798 Alexandria, Virginia, US |
| Died | January 5, 1872 (aged 73) Loudoun County, Virginia, US |
| Political party | Whig |
| Spouse | Alicia Marmaduke |
| Residence | Leesburg, Virginia |
| Profession | Law |
John Janney (November 8, 1798 – January 5, 1872) was a member of the Whig Party in Virginia prior to its demise, delegate to the Virginia General Assembly from Loudoun County and served as President of the Virginia Secession Convention in 1861.