Alleyne FitzHerbert, 1st Baron St Helens, was a British diplomat. He was Minister Plenipotentiary to Russia from 1783 to 1788, appointed Chief Secretary for Ireland and a member of the Privy Council in 1787, serving in the former position until 1789. He was Minister Plenipotentiary to Spain from 1790 to 1794.
- Occupation
- diplomat, politician
- Position held
- Member of Parliament in the Parliament of Ireland, Member of the Privy Council of Ireland, Ambassador of the United Kingdom of Great Britain and Ireland to the Russian Empire, ambassador of the United Kingdom to Belgium
- Citizenship
- United Kingdom of Great Britain and Ireland, Kingdom of Great Britain
