Humphrey de Bohun, 2nd Earl of Hereford, English politician, Lord High Constable of England (born 1208)

Humphrey IV de Bohun, 2nd Earl of Hereford, 1st Earl of Essex was an Anglo-Norman nobleman and soldier who served as hereditary Constable of England.

The Lord High Constable of England is the seventh of the Great Officers of State, ranking beneath the Lord Great Chamberlain and above the Earl Marshal. This office is now called out of abeyance only for coronations. The Lord High Constable was originally the commander of the royal armies and the Master of the Horse. He was also, in conjunction with the Earl Marshal, president of the court of chivalry or court of honour. In feudal times, martial law was administered in the court of the Lord High Constable.