What are the names of all British prime ministers who attended Eaton?

Answer 1

I found the following at Eton College web site(etoncollege.com) (apparently, it is spelled 'Eton', not 'Eaton'. A fact I did not realize until after I had spent some time ignoring it.)

In chronological order of office: Walpole, Sir Robert, KG, 1st Earl of Orford (1676-1745) PM 1721-1742

Pitt, William, 1st Earl of Chatham (1708-1778) PM 1756-1757, 1757-1761 and 1766-1768

Bute, John Stuart, 3rd Earl of (1713-1792) PM 1762-1763

Grenville, George (1712-1770) PM 1763-1765

North, Frederick, 8th Baron (1732-1792) PM 1770-1782

Grenville, William, 1st Baron (1759-1834) PM 1806-1807

Canning, George (1770-1827) PM 1827

Wellington, Arthur Wellesley, 1st Duke of (1769-1852) PM 1828-1830 and 1834

Grey, Charles, 2nd Earl (1764-1845) PM 1830-1834

Melbourne, William Lamb, 2nd Viscount (1779-1848) PM 1834 and 1835-1841

Derby, Edward Stanley, 14th Earl of (1799-1869) PM 1852, 1858-1859 and 1866-1868

Gladstone, William Ewart (1809-1898) PM 1868-1874, 1880-1885, 1886 and 1892-1894

Salisbury, Robert Cecil, 3rd Marquess of (1830-1903) PM 1885-1886, 1886-1892 and 1895-1902

Rosebery, Archibald Primrose, 5th Earl of (1847-1929) PM 1894-1895

Balfour, Arthur (1848-1930) PM 1902-1905, later 1st Earl of Balfour

Eden, Sir Anthony (1897-1977) PM 1955-1957, later 1st Earl of Avon

Macmillan, Harold (1894-1986) PM 1957-1963, later 1st Earl of Stockton

Douglas-Home, Sir Alec (1903-1995) PM 1963-1964, formerly 14th Earl of Home, later Baron Home of the Hirsel

NOTE: Notwithstanding at least one edition of the Dictionary of National Biography, the 3rd Duke of Portland (PM 1807-1809) was educated at Westminster, not Eton. The 2nd Earl Waldegrave has also been listed elsewhere as an Old Etonian prime minister - he did not in fact succeed in forming an administration (in 1757), and there is no proof that he was at Eton.