William Henry Grenfell, 1st Baron Desborough, was a British athlete, sportsman, public servant and politician. He sat in the House of Commons first for the Liberal Party and then for the Conservatives between 1880 and 1905 when he was raised to the peerage. He also was President of the Thames Conservancy Board for thirty-two years.

The Thames Conservancy was a body responsible for the management of that river in England. It was founded in 1857 to replace the jurisdiction of the City of London up to Staines. Nine years later it took on the whole river from Cricklade in Wiltshire to the sea at Yantlet Creek on the Isle of Grain. Its territory was reduced when the Tideway was transferred to the Port of London Authority in 1909.