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.

• Institute of Historical Research (pre-1646)
• Institute of Historical Research (post 1660)