| Honorific Prefix: | The Right Honourable |
| The Viscount Hereford | |
| Birth Date: | 3 January 1843 |
| Death Place: | London |
| Alma Mater: | Eton College Sandhurst |
| Spouse: | Mary Ann Morgan |
| Known For: | Premier Viscount of England Father of the House of Lords |
| Nationality: | British |
Robert Devereux, 16th Viscount Hereford (3 January 1843 – 27 March 1930) was an English Peer. The Viscountcy of Hereford is the oldest extant viscountcy in the Peerage of England, making the holder the Premier Viscount of England.
Lord Hereford was the eldest son of the Rev. Canon Robert Devereux, 15th Viscount Hereford. He was educated at Eton and Sandhurst. He was a JP and DL for Breconshire, a JP for Herefordshire and Radnorshire, and a county alderman for Monmouthshire.
On 16 July 1863 he married the Hon. Mary Anne Morgan, youngest daughter of Charles Morgan, 1st Baron Tredegar. They had six children.
Lord Hereford died in 1930 shortly after becoming Father of the House of Lords having been a peer for 74 years and seven months.[1]
| Crest: | Out of a Ducal Coronet Or a Talbot's Head Argent eared Gules |
| Coronet: | A Coronet of a Viscount |
| Escutcheon: | Argent a Fess Gules in chief three Torteaux |
| Supporters: | Dexter: a Talbot Argent eared Gules ducally gorged of the last; Sinister: a Reindeer proper horned ducally gorged and lined Or |
| Motto: | Virtutis Comes Invidia |