The Chief Secretary was the most important position for determining British policy in Ireland after the Lord Lieutenant, and was frequently a cabinet level position in the 19th and early twentieth centuries.
Chief Secretary's Office, Dublin Castle
By the late 19th century, power had effectively shifted from the Lord Lieutenant across the courtyard of Dublin Castle to his number two, the Chief Secretary for Ireland.
Chief Secretaries for Ireland, 1660-1922
- Matthew Lock 1660
- Sir Thomas Page 1662-1669
- Sir Henry Ford 1669-1670
- Sir Ellis Leighton 1670-1672
- Sir Henry Ford 1672-1673
- Sir William Harbord 1673-1676
- Sir Cyril Wyche 1676-1682
- Sir William Ellis 1682-1685
- Sir Paul Rycaut 1686-1687
- Thomas Sheridan 1687-1688
- Patrick Tyrrell 1688-1689
- John Davis 1690-1692
- Sir Cyril Wyche 1692-1693
- Sir Richard Aldworth 1695-1696
- William Palmer 1696-1697
- Matthew Prior 1697-1699
- Humphrey May 1699-1701
- Francis Gwyn 1701-1703
- Edward Southwell 1703-1707
- George Dodington 1707-1708
- Joseph Addison 1708-1710
- Edward Southwell 1710-1713
- Sir John Stanley 1713-1714
- Joseph Addison 1714-1715
- Martin Bladen and Charles Delafaye 1715-1717
- Edward Webster 1717-1720
- Horatio Walpole 1720-1721
- Edward Hopkins 1721-1724
- Thomas Clutterbuck 1724-1730
- Walter Cary 1730-1737
- Sir Edward Walpole 1737-1739
- Thomas Townshend 1739
- Henry Bilson Legge 1739-1741
- William Ponsonby, Viscount Duncannon 1741-1745
- Richard Lidell 1745-1746
- Sewallis Shirley 1746
- Edward Weston 1746-1750
- Lord George Sackville 1750-1755
- Henry Seymour Conway 1755-1757
- Richard Rigby 1757-1761
- William Gerard Hamilton 1761-1764
- Charles Moore, 6th Earl of Drogheda 1764-1765
- Francis Seymour Conway, Viscount Conway 1765-1766
- Augustus John Hervey 1766-1767
- Theophilus Jones 1767
- Lord Frederick Campbell 1767-1768
- Sir George Macartney 1769-1772
- Sir John Blaquiere 1772-1776
- Sir Richard Heron 1776-1780
- William Eden 1780-1782
- Richard FitzPatrick 1782
- William Wyndham Grenville 1782-1783
- William Windham 1783
- Thomas Pelham 1783-1784
- Thomas Orde 1784-1787
- Alleyne FitzHerbert 1787-1789
- Robert Hobart 1789-1793
- Sylvester Douglas 1793-1794
- George Damer, Viscount Milton 1794-1795
- Thomas Pelham 1795-1798
- Robert Stewart, Viscount Castlereagh 1798-1801
- Charles Abbot 1801-1802
- William Wickham 1802-1804
- Sir Evan Nepean 1804-1805
- Nicholas Vansittart 1805
- Charles Long 1805-1806
- William Elliot 1806-1807
- Sir Arthur Wellesley 1807-1809
- Robert Dundas 1809
- William Wellesley-Pole 1809-1812
- Robert Peel 1812-1818
- Charles Grant 1818-1821
- Henry Goulburn 1821-1827
- William Lamb 1827-1828
- Sir Francis Leveson Gower 1828-1830
- Sir Henry Hardinge 1830
- Edward Geoffrey Smith-Stanley 1830-1833
- Sir John Cam Hobhouse 1833
- Edward John Littleton 1833-1834
- Sir Henry Hardinge 1834-1835
- George Howard, Viscount Morpeth 1835-1841
- Edward Granville Eliot, Lord Eliot 1841-1845
- Sir Thomas Francis Fremantle 1845-1846
- Henry Pelham-Clinton, Earl of Lincoln 1846
- Henry Labouchere 1846-1847
- Sir William Meredyth Somerville 1847-1852
- Richard Southwell Bourke, Lord Naas 1852
- Sir John Young 1853-1855
- Edward Horsman 1855-1857
- Henry Arthur Herbert 1857-1858
- Richard Southwell Bourke, Lord Naas 1858-1859
- Edward Cardwell 1859-1861
- Sir Robert Peel 1861-1865
- Chichester Parkinson-Fortescue 1865-1866
- Richard Southwell Bourke, 6th Earl of Mayo 1866-1868
- John Wilson-Patten 1868
- Chichester Parkinson-Fortescue 1868-1871
- Spencer Compton Cavendish, Marquess of Hartington 1871-1874
- Sir Michael Hicks-Beach 1874-1878
- James Lowther 1878-1880
- William Edward Forster 1880-1882
- Lord Frederick Charles Cavendish 1882
- George Otto Trevelyan 1882-1884
- Henry Campbell-Bannerman 1884-1885
- Sir William Hart Dyke 1885-1886
- William Henry Smith 1886
- John Morley 1886
- Sir Michael Hicks-Beach 1886-1887
- Arthur James Balfour 1887-1891
- William Lawies Jackson 1891-1892
- John Morley 1892-1895
- Gerald William Balfour 1895-1900
- George Wyndham 1900-1905
- Walter Hume Long 1905
- James Bryce 1905-1907
- Augustine Birrell 1907-1916
- Henry Edward Duke 1916-1918
- Edward Shortt 1918-1919
- James Ian Macpherson 1919-1920
- Sir Hamar Greenwood 1920-1922