| Roger Mompesson | |
| Honorific-Suffix: | MP |
| Office1: | Member of Parliament for Southampton |
| Parliament1: | 3rd and 4th, William III and Mary II |
| Predecessor1: | Benjamin Newland |
| Successor1: | Adam de Cardonnel |
| Alongside1: | John Smith, Mitford Crowe |
| Term Start1: | 27 December 1699 |
| Term End1: | November 1701 |
| Office2: | Judge, Vice Admiralty for Massachusetts, New Hampshire, Rhode Island and Pennsylvania |
| Term Start2: | April 1703 |
| Term End2: | 1704 |
| Office3: | Judge, Vice Admiralty for Connecticut, New Jersey and New York |
| Term Start3: | April 1703 |
| Term End3: | 1715 |
| Order4: | Chief Justice of the |
| Office4: | New York Supreme Court |
| Term Start4: | 1704 |
| Term End4: | 1715 |
| Predecessor4: | John Bridges |
| Successor4: | Lewis Morris |
| Order5: | Chief Justice of the |
| Office5: | New Jersey Supreme Court |
| Term Start5: | October 1704 |
| Term End5: | April 1709 |
| Predecessor5: | Office created |
| Successor5: | Thomas Gordon |
| Term Start6: | August 1709 |
| Term End6: | 14 February 1710 |
| Predecessor6: | Thomas Gordon |
| Successor6: | David Jamison |
| Order7: | Chief Justice of the |
| Office7: | Pennsylvania Supreme Court |
| Term Start7: | April 1706 |
| Term End7: | 1706 |
| Predecessor7: | John Guest |
| Successor7: | David Lloyd |
| Office8: | Member of the New Jersey Provincial Council for the Eastern Division |
| Term Start8: | 29 November 1705 |
| Term End8: | 1715 |
| Office9: | Member of the New York Provincial Council |
| Term Start9: | 1705 |
| Term End9: | 1715 |
| Birth Date: | c. 1661 |
| Birth Place: | Durnford, Langton Matravers, Dorset, England |
| Death Date: | 1715 |
| Nationality: | English |
| Spouse: | Martha Pinhorne |
| Children: | Pinhorne Mompesson |
| Alma Mater: | Magdalen Hall, Oxford |
| Profession: | Lawyer |
Roger Mompesson (c. 1661 – 1715) was a Member of Parliament for Southampton who also held many judicial and legislative offices in British North America.
Born around 1661, Roger Mompesson was the son of George Mompesson and Elizabeth Clavell. He was educated at Magdalen Hall, Oxford, and was a lawyer.[1]
He was appointed Recorder of Southampton in May 1668, and was elected to Parliament in 1669. Mompesson served as MP for Southampton until the election of November 1701, when he lost his seat. He did not stand for election in 1702. In 1703 his recordership was declared void due to neglect.
Mompesson had become involved in engagements to pay some debts incurred by his father; this placed him in an embarrassing situation. In April 1703 he accepted an appointment as Judge of the Vice Admiralty for Connecticut, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island and Pennsylvania. As he was appointed Chief Justice of New York in July 1704 he gave up four of the colonies, retaining New York, New Jersey and Connecticut until his death in 1715.
In October 1704 Roger Mompesson was appointed as the first chief justice of New Jersey and, with the exception of a few months during the administration of Lord Lovelace, held office until 14 February 1710. In February 1705 he was sworn of the New York Provincial Council, and on 29 November 1705 he was appointed to a seat on the New Jersey Provincial Council representing the Eastern Division; he held seats in both Councils until his death.[2]
In April 1706 he was appointed Chief Justice of Pennsylvania, but no evidence exists that he ever entered upon his duties there.