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.