Algernon George Percy, 6th Duke of Northumberland, KG, PC, DL (20 May 1810 – 2 January 1899), styled Lord Lovaine between 1830 and 1865 and Earl Percy between 1865 and 1867, was a British Conservative politician. He held office under the Earl of Derby as Paymaster-General and Vice-President of the Board of Trade in 1859 and under Benjamin Disraeli as Lord Privy Seal between 1878 and 1880.