Viscount Hereford is the senior Viscount in the Peerage of England. The Viscount is also the only one of the three English Viscounts who does not hold a higher title. The peerage dates to 1550. In 1611 Edward Devereux , a younger son of Walter Devereux, 1st Viscount Hereford , was created a baronet by King James I. On the death of the 4th viscount (also the 3rd Earl of Essex), Sir Edward's son Walter succeeded to the viscouncty, and the baronetcy and viscountcy have remained merged.

Viscounts Hereford (1550)

• Walter Devereux, 1st Viscount Hereford (1489-1558)
• Walter Devereux, 1st Earl of Essex, 2nd Viscount Hereford (1539-1576)
• Robert Devereux, 2nd Earl of Essex, 3rd Viscount Hereford (1566-1601
• Robert Devereux, 3rd Earl of Essex, 4th Viscount Hereford (1591-1646)
• Walter Devereux, 5th Viscount Herford (1578-1658)
• Leicester Devereux, 6th Viscount Hereford (1617-1676)
• Leicester Devereux, 7th Viscount Hereford (1674-1683)
• Edward Devereux, 8th Viscount Hereford (1675-1700)
• Price Devereux, 9th Viscount Hereford (d.1740)
• Price Devereux, 10th Viscount Hereford (1694-1748)
• Edward Devereux, 11th Viscount Hereford (d.1760)
• Edward Devereux, 12th Viscount Hereford (1740-1783)
• George Devereux, 13th Viscount Hereford (1744-1804
• Henry Devereux, 14th Viscount Hereford (1777-1843)
• Robert Devereux, 15th Viscount Hereford (d.1855)
• Robert Devereux, 16th Viscount Hereford (1843-1930)
• Robert Charles Devereux, 17th Viscount Hereford (1865-1952)
• Robert Milo Leicester Devereux, 18th Viscount Hereford (1932-2004)
• Charles Robin De Bohun Devereux, 19th Viscount Hereford (b. 1975)

Devereux Baronets of Castle Bromwich (1611)

• Sir Edward Devereux, 1st Baronet (c. 1550–1622)
• Sir Walter Devereux, 2nd Baronet (1578–1658) (succeeded to the viscountcy in 1646)