Joseph Montague Kenworthy, 10th Baron Strabolgi (7 March 1886 – 8 October 1953), was a Liberal and then a Labour Party Member of Parliament in the United Kingdom.

Strabolgi was born at Leamington in Warwickshire and educated at the Eastman's Royal Naval Academy at Northward Park in Winchester and as a cadet on H.M.S.

His first posting as a naval cadet was in January 1903 to the battleship HMS Goliath,[1] serving on the China Station.

Of the 244 executive officers for whom it has been possible to find their Sub-Lieutenant examination results, twenty-three failed an exam (9 per cent), and Kenworthy was one of these.

)Kenworthy first tried to enter Parliament at the 1918 general election contesting Rotherham as a Liberal but finished in third place.

During the 1924-29 parliament which was dominated by a Conservative majority, he worked closely with a group of radical Liberal MPs that included: William Wedgwood Benn, Percy Harris, Frank Briant and Horace Crawfurd to provide opposition to the government.

He also resigned his seat in the House of Commons and fought and won a by-election in Central Hull, standing for Labour.

When he died in 1953 aged 67, he was succeeded by his eldest son, David Montague de Burgh Kenworthy, 11th Baron Strabolgi, another left-wing politician and member of the Labour Party.