| Honorific Suffix: | 6th Earl Stanhope |
| Birth Date: | 1838 9, df=y |
| Mother: | Emily Harriet Kerrison |
| Spouse: | Evelyn Pennefather |
| Children: | 2 |
| Party: | Conservative Party |
| Relatives: | James Stanhope (son) Edward Stanhope (brother) Philip Stanhope (brother) Sir Edward Kerrison (uncle) |
| Office: | Member of Parliament for Leominster |
| Term Start: | 1868 |
| Term End: | 1868 |
| Alongside: | Richard Arkwight |
| Predecessor: | Arthur Walsh Richard Arkwight |
| Successor: | Richard Arkwight |
| Office2: | Member of Parliament for Suffolk East |
| Term Start2: | 1870 |
| Term End2: | 1875 |
| Alongside2: | Frederick Snowdon Corrance (1870-74) The Lord Rendlesham (1874-75) |
| Predecessor2: | John Henniker-Major Frederick Snowdon Corrance |
| Successor2: | The Lord Rendlesham Frederick St John Barne |
Arthur Philip Stanhope, 6th Earl Stanhope (13 September 1838 – 19 April 1905), was a British Conservative Party politician. From 1855 to 1875 he was styled Viscount Mahon.
He was a son of Philip Stanhope, 5th Earl Stanhope by his wife Emily Harriet Kerrison. As Viscount Mahon, he sat for a few months of 1868 as a Member of Parliament for Leominster and returned to the Commons as member for Suffolk East from 1870 to 1875. He was Chairman of the National Union of Conservative and Constitutional Associations in 1875.[1]
Lord Mahon succeeded to the title of Earl Stanhope on the death of his father on 24 December 1875. He was appointed First Church Estates Commissioner in December 1878, and served as Lord Lieutenant of Kent from 1890 to 1905.
He married Evelyn Pennefather, daughter of Richard Pennefather of Knockeevan, County Tipperary by his wife Lady Emily Butler, daughter of Richard Butler, 1st Earl of Glengall. They had two children: