How many prime ministers served under Queen Victoria?

Queen Victoria of Great Britain and Ireland reigned from 20th June 1837 until 22nd January 1901. During her reign, the Prime Ministers were: William Lamb, 2nd Viscount Melbourne, in office from 18th April 1835 to 30th August 1841. Sir Robert Peel, 2nd Baronet of Drayton Manor, in office from 30th August 1842 to 29th June 1846. John Russell, 1st Earl Russell, in office from 30th June 1846 to 23rd February 1852. Edward Smith-Stanley, 14th Earl of Derby, in office from 23rd February 1852 to 19th December 1852. George Hamilton-Gordon, 4th Earl of Aberdeen, in office from 19th December 1852 to 30th January 1855. Henry John Temple, 3rd Viscount Palmerston, in office from 6th February 1855 to 19th February 1858. Edward Smith-Stanley, 14th Earl of Derby, in office from 20th February 1858 to 12th June 1859. Henry John Temple, 3rd Viscount Palmerston, in office from 12th June 1859 to 18th October 1865. John Russell, 1st Earl Russell, in office from 29th October 1865 to 28th June 1866. Edward Smith-Stanley, 14th Earl of Derby, in office from 28th June 1866 to 27th February to 27th February 1868. Benjamin Disraeli, 1st Earl of Beaconsfield, in office from 27th February 1868 to 1st December 1868. William Ewart Gladstone, in office from 3rd December 1868 to 17th February 1874. Benjamin Disraeli, 1st Earl of Beaconsfield, in office from 20th February 1874 to 21st April 1880. William Ewart Gladstone, in office from 23rd April 1880 to 9th June 1885. Robert Cecil, 3rd Marquess of Salisbury, in office from 23rd June 1885 to 28th January 1886. William Ewart Gladstone, in office from 1st February to 20th July 1886. Robert Cecil, 3rd Marquess of Salisbury, in office from 25th July 1886 to 11 August 1892. William Ewart Gladstone, in office from 15th August 1892 to 2nd March 1894. Archibald Primrose, 5th Earl of Rosebery, in office from 5th March 1894 to 22nd June 1895. Robert Cecil, 3rd Marquess of Salisbury, in office from 25th January 1895 to 11th June 1902.