Jeffrey Hammond (born 30 July 1946), also known by his former stage name Jeffrey Hammond-Hammond, is an English artist and musician who was the bassist of progressive rock band Jethro Tull from 1971 to 1975. Hammond played on some of the band's most successful albums, including Aqualung (1971) and Thick as a Brick (1972).
Hammond adopted the name "Hammond-Hammond" as a joke, since both his father's surname and mother's maiden name were the same.
