| Honorific Prefix: | The Right Honourable |
| Sir Capel Molyneux, Bt | |
| Honorific Suffix: | PC (Ire) |
| Office: | Member of Parliament for Clogher |
| Term Start: | 1776 |
| Term End: | 1783 |
| Predecessor: | John Staples William Moore |
| Alongside: | Thomas St George |
| Successor: | Sackville Hamilton Thomas St George |
| Office1: | Member of Parliament for Dublin University |
| Term Start1: | 1768 |
| Term End1: | 1776 |
| Predecessor1: | William Clement Philip Tisdall |
| Alongside1: | Philip Tisdall |
| Successor1: | Richard Hely-Hutchinson Walter Burgh |
| Office2: | Member of Parliament for Clogher |
| Term Start2: | 1761 |
| Term End2: | 1768 |
| Predecessor2: | Richard Vincent Nehemiah Nixon Donnellan |
| Alongside2: | Samuel Lowe, William Moore |
| Successor2: | John Staples William Moore |
| Birth Date: | 1717 |
| Spouse: | |
Sir Capel Molyneux, 3rd Baronet PC (Ire) (1717 – August 1797) was an Irish politician.
Capel was the son of Sir Thomas Molyneux, 1st Baronet and his second wife Catherine Howard, daughter of Professor Ralph Howard. In 1738 he succeeded his brother Daniel to the title of Baronet and to all the family estates except Castle Dillon, which he did not inherit until 1759, when the former wife of his late first cousin died.[1]
Capel graduated with a Bachelor of Arts in 1737 and received an honorary LLD in 1768.[1]
He was appointed High Sheriff of Armagh in 1744[2] and sat for Clogher in the Irish House of Commons from 1761 to 1768. Subsequently, he represented Dublin University to 1776 and then again for Clogher to 1783. He was invested to the Privy Council of Ireland in 1776.
His first marriage was in 1747 to Elizabeth East, sister of Sir William East, 1st Baronet, they had two sons and two daughters:
In 1757 his first wife died and he married Elizabeth Adlercron, a daughter of Elizabeth Arabin and Lt. Gen. John Adlercron, formerly Commander-in-Chief, India, on 17 August 1766. By her he had two sons:[7]
Sir Capel died in August 1797 and was succeeded in the baronetcy by his eldest son, Capel.[8]
Through his daughter Anne, he was a grandfather of Sir William Brabazon, 2nd Baronet, and Sarah Brabazon (who married Henry Roper-Curzon, 14th Baron Teynham). Through his daughter Harriet, he was a grandfather of William St Julien Arabin, who served as the Judge-Advocate-General of the Army.[9] [10]