Joseph Foster Barham, the younger (1759–1832) was an English politician, merchant and plantation owner.
He was the son of Joseph Foster Barham I (formerly Joseph Foster) of Bedford and his wife Dorothea Vaughan.Thomas Foster Barham was his brother.
In 1789 Foster Barham inherited his father's Mesopotamia estate in Jamaica, and a partnership in the West Indian merchants Barham & Plummer with Thomas Plummer, Member for Ilchester. In 1815 he withdrew from the partnership in favour of his brother and broke off dealings with the Atlantic slave trade.
In 1793 Foster Barham was elected as Member of Parliament for , resigning the seat in 1799. He was elected MP for Stockbridge again in 1802, sitting until 1806. He was subsequently elected for Okehampton (1806–07) and for a third time for Stockbridge (1807–22).
In a debate on an 1815 bill to abolish slavery, he stated that British capital upheld the Spanish slave trade, half of the Danish, and part of the Portuguese.
Foster Barham sold his Stockbridge borough seat to Earl Grosvenor in the early 1820s. He died on 28 September 1832 near Bedford, at the house of his sister Mary Livius.
Foster Barham married Lady Caroline Tufton, daughter of Sackville Tufton, 8th Earl of Thanet. They had three sons and two daughters:
I