Richard Seymour-Conway, 4th Marquess of Hertford

The Most Honourable The Marquess of Hertford KG
Portrait photograph by Étienne Carjat, c. 1860 (Wallace Collection)
Member of Parliament for Antrim
In office 1822–1826
Preceded by	Hugh Seymour
Succeeded by	Edward Macnaghten
Personal details
Born	(1800-02-22)22 February 1800 England
Died	25 August 1870(1870-08-25) (aged 70) Paris, France
Children	Sir Richard Wallace, 1st Baronet
Parent(s)	Francis Seymour-Conway, 3rd Marquess of Hertford Maria Emilia Fagnani

Captain Richard Seymour-Conway, 4th Marquess of Hertford KG (22 February 1800 – 25 August 1870) was an English aristocrat and sometime politician who spent his life in France devoted to collecting art. From birth to 1822 he was styled Viscount Beauchamp and from 1822 to 1843 Earl of Yarmouth.