Sir John Fiennes Twisleton Crampton, 2nd Baronet, KCB was a British diplomat, minister to the United States from 1852 to 1856 and Minister to Russia from 1858 to 1860.
- Occupation
- diplomat
- Position held
- ambassador of the United Kingdom to Hanover, Ambassador of the United Kingdom of Great Britain and Ireland to the Russian Empire, Ambassador of the United Kingdom of Great Britain and Ireland to Spain, ambassador of the United Kingdom of Great Britain and Ireland to the United States
- Citizenship
- United Kingdom of Great Britain and Ireland
- Born
- 1805, August 12, 1805