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

• John "Wynn" ap Maredudd 1543 – bef. 1558
• Lewis ap Owen 1553–1555 ^[1]
• Ellis Price bef. 1558 – bef. 1562
• Owen ap John ap Howell Vaughan bef. 1562 – bef. 1564
• Ellis Price bef. 1564 – aft.1577
• Robert Dudley, 1st Earl of Leicester bef. 1579 –1588
• Sir Robert Salusbury bef. 1594–1599
• Sir Thomas Myddelton bef. 1599 –1617
• William Salusbury 1617 – aft. 1626
• Hugh Nanney 1629–1646
• Interregnum
• Sir Thomas Myddelton, 1st Baronet 1660–1663
• Sir John Owen 1663–1666
• William Owen 1666–1678
• Sir John Wynn, 5th Baronet 1678–1688
• William Herbert, 1st Marquess of Powis 1688–1689
• Sir William Williams, 1st Baronet 1689–1690
• Sir John Wynn, 5th Baronet 1690–1711
• Edward Vaughan 1711–1718
• Lewis Owen 1722–1729
• William Vaughan 1731–1775

For later custodes rotulorum, see Lord Lieutenant of Merionethshire.