Alleyne FitzHerbert, 1st Baron St Helens

The Lord St Helens
Chief Secretary for Ireland
In office
1787–1789
Preceded byThomas Orde-Powlett
Succeeded byRobert Hobart
Personal details
Born1 March 1753 (1753-03)
Derby
Died19 February 1839 (1839-02-20) (aged 85)
Grafton Street, London
Parent(s)William and Mary Fitzherbert
EducationSt John's College, Cambridge
Occupationdiplomat

Alleyne FitzHerbert, 1st Baron St Helens, PC (1 March 1753 – 19 February 1839) 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 (Great Britain & Ireland) in 1787, serving in the former position until 1789. He was Minister Plenipotentiary to Spain from 1790 to 1794.

He was a friend of explorer George Vancouver, who named Mount St. Helens in what is now the U.S. state of Washington after him.