John Lubbock, 3rd Baron Avebury (13 May 1915 – 21 June 1971), was an English hereditary peer and member of the House of Lords.
He was the son of Harold Fox Pitt Lubbock and a grandson of John Lubbock, 1st Baron Avebury. His sister Moyra was married to broadcaster Dorian Williams from 1938 to 1949. He succeeded his uncle, John Lubbock, 2nd Baron Avebury, as Baron Avebury in 1929.
He was married three times:
Lord Avebury died in 1971, aged 56, and was succeeded by his first cousin Eric Lubbock.