Dudley Ryder, 2nd Earl of Harrowby, KG, PC, FRS, styled Viscount Sandon between 1809 and 1847, was a British politician. He held office under Lord Palmerston as Chancellor of the Duchy of Lancaster in 1855 and as Lord Privy Seal between 1855 and 1858.

Dudley Ryder, 1st Earl of Harrowby, PC, FSA was a prominent British politician of the Pittite faction and the Tory party.