Henry Riversdale Grenfell (5 April 1824 – 11 September 1902) was a British banker and Liberal Party politician.
His Cornish grandfather Pascoe Grenfell was a tin and copper manager and Member of Parliament (MP), while his father, Charles Pascoe Grenfell, was a director of the Bank of England from 1830 to 1864. His maternal grandfather was William Philip Molyneux, 2nd Earl of Sefton.
He was MP for Stoke-upon-Trent between 1862 and 1868.
He was a leading member of the Bimetallic League, and Governor of the Bank of England between 1881 and 1883 following a periods as its Deputy Governor.
His son, Edward Grenfell also became a Member of Parliament and Bank of England director, and was the partner of Junius Spencer Morgan in the firm of Morgan, Grenfell & Company.