This is a list of people who have served as Custos Rotulorum of Somerset.
Sir William Portman bef. 1554–1557
Sir Hugh Paulet bef. 1558–1573
Sir Amias Paulet bef. 1577–1588
Sir John Popham bef. 1594–1607
Sir Edward Phelips 1608–1614
James Ley, 1st Baron Ley bef. 1621–1625
Henry Ley, 2nd Earl of Marlborough 1625–1636
John Coventry 1636–1646
Interregnum
William Seymour, 2nd Duke of Somerset 1660
Charles Berkeley, 2nd Viscount Fitzhardinge 1660–1668
Henry Somerset, 3rd Marquess of Worcester 1668–1672
John Seymour, 4th Duke of Somerset 1672–1675
Maurice Berkeley, 3rd Viscount Fitzhardinge 1675–1688
Henry Waldegrave, 1st Baron Waldegrave 1688
Maurice Berkeley, 3rd Viscount Fitzhardinge 1688–1690
John Berkeley, 4th Viscount Fitzhardinge 1690–1712
John Poulett, 1st Earl Poulett 1713–1714
Charles Boyle, 4th Earl of Orrery 1714–1721
For later custodes rotulorum, see Lord Lieutenant of Somerset.