Wentworth Dillon, 4th Earl of Roscommon (1637–1685), was an Anglo-Irish soldier and poet.
| Family tree |
| Wentworth Dillon with his two wives, his parents, and other selected relatives. Both his marriages were childless. |
| | | | | James 1st Earl d. 1641 | | Eleanor Barnewall d. 1628 | | |
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| | | Margaret Barry | | Robert 2nd Earl d. 1642 | | Ann Strode; | | | | |
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| | James 3rd Earl c. 1605 – 1649 | | Elizabeth Wentworth; | | | | Carey 5th Earl 1627–1689 | | |
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Frances Boyle | | Wentworth 4th Earl 1637–1685 | | Isabella Boynton d. 1721 | | Robert 6th Earl d. 1715 | | |
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| | | | Robert 7th Earl d. 1721 | | Angel Ingoldsby; | | James 8th Earl d. 1746 unmarried | |
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