Thomas Barnwall Martin (1784 – April 1847) was an Irish landowner and politician.
Following an unhappy conclusion to a love affair with the daughter of a local chandler, Thomas left home to join the army.
Despite a personal commendation by the Duke of Wellington himself, Martin returned to Ireland where he later married, inherited the family estate centred at Ballynahinch Castle in Connemara, and successfully campaigned for his father's former seat in Parliament in 1832 and served in this position until his death.
They had one daughter, Mary Letitia Martin (d. 30 October 1850), an author who married Arthur G. Bell.
This article about a Member of the Parliament of the United Kingdom, for a constituency in Ireland between 1801 and 1922 is a stub.