This is a list of people who have served as Custos Rotulorum of Carmarthenshire.

• Richard Devereux 1543 – bef. 1558
• Sir Thomas Jones bef. 1558 – bef. 1559
• Sir Henry Jones bef. 1562–1586
• Sir Thomas Jones 1586 – bef. 1594
• Edward Dunlee bef. 1594–1595
• Sir Thomas Jones 1595–1604
• Sir Henry Jones 1605 – bef. 1637
• Sir Henry Jones, 1st Baronet 1637–1644
• Richard Vaughan, 2nd Earl of Carbery 1644–1646
• Interregnum
• Sir John Lloyd, 1st Baronet Mar–July 1660
• Richard Vaughan, 2nd Earl of Carbery 1660–1686
• John Vaughan, 3rd Earl of Carbery 1686–1713
• Charles Paulet, 3rd Duke of Bolton 1714–1735
• Sir Nicholas Williams, 1st Baronet 1735–1745
• Thomas Williams of Edwinsford (brother of Nicolas Williams, 1st Baronet) 1746–1762
• George Rice 1762–1779

For later custodes rotulorum, see Lord Lieutenant of Carmarthenshire.