Baron Hervey is a title that has been created three times, once in the Peerage of Ireland and twice in the Peerage of England. The first creation came in the Peerage of Ireland in 1620 when William Hervey was made Baron Hervey, of Rosse in the County of Wexford. In 1628 he was also created Baron Hervey, of Kidbrooke in the County of Kent, in the Peerage of England. However, both titles became extinct on his death in 1642.
The third creation came in the Peerage of England in 1703 when John Hervey was made Baron Hervey, of Ickworth in the County of Suffolk. He was a second cousin thrice removed of the holder of the 1620 and 1628 creations and was kater created Earl of Bristol. For more information, see the Marquess of Bristol.