Henry Somer (c.1370 – 23 March 1450) was a mediaeval English courtier and Member of Parliament who was Chancellor of the Exchequer.
Somer, possibly born in Kent, moved to London as a young man to be a member of the court of King Richard II.
When Henry V ascended the throne in 1413 Somer was accused of misuse of public funds but after mounting a stout defence the charges against him were dropped.
In 1402 he married Katherine, the widow and heiress of Mark Le Faire, a wealthy Winchester merchant and MP.
During his life he accumulated land in Edmonton and Tottenham in Middlesex and an estate in Grantchester, Cambridgeshire, enabling him to serve as a Justice of the Peace for both counties for many years.