Ashley George John Ponsonby, DL, JP (24 June 1831 – 12 January 1898), was a British Liberal politician.
Ponsonby sat as Member of Parliament for Cirencester between 1852 and 1857 and again between 1859 and 1865.
He was also a captain in the Grenadier Guards and a Justice of the Peace and Deputy Lieutenant of Gloucestershire.
Ponsonby married Louisa Frances Charlotte Gordon, daughter of Lord Henry Gordon, in 1857.
He lived at Prince's Gardens in London and at Heatherfield in Ascot, Berkshire, now Heatherwood Hospital.