Humphrey de Bohun, 3rd Earl of Hereford and 2nd Earl of Essex (1249 – December 31, 1297) was one of several noblemen of the same name to have held the earldom of Hereford, and a key figure in the Norman conquest of Wales.

He was the son of Humphrey de Bohun, by Eleanor de Braose, a daughter of William de Braose, Lord of Abergavenny and Eve Marshall. His mother died in 1251; his father died in 1265 of wounds sustained at the Battle of Evesham. He succeeded his grandfather, Humphrey de Bohun, 2nd Earl of Hereford, in 1275 as Earl of Hereford and Essex and Lord High Constable.

Humphrey de Bohun took part in Roger Mortimer's war against the Welsh, and was present at the defeat at Cefnllys in November, 1262, by Llywelyn ap Gruffydd. Around 1264, he was made Lord Warden of the Cinque Ports.

In 1297, he joined Roger Bigod, 5th Earl of Norfolk in refusing to serve in Gascony unless in the presence of the king. He died at Pleshy Castle, in Essex.

Family
Humphrey de Bohun married Maud de Fiennes (d. bef. 1347) sometime between 1264 and July 17, 1275. Maud was born between 1236 and 1259, a daughter of Enguerrand II de Fiennes and Isabel de Conde. Their son, another Humphrey de Bohun, succeeded him as the Earl of Hereford and Essex and Lord High Constable.