Sir Thomas Lighton, 1st Baronet (died 27 April 1805) was an Ulster Scots banker and politician.
He returned to Ireland and used his money to establish the Lighton, Needham & Shaw Bank in Dublin alongside Robert Shaw.
He held the office of High Sheriff of County Dublin in 1790.
Between 1790 and 1797 Lighton sat in the Irish House of Commons as the Member of Parliament for Tuam.
On 1 March 1791 he was created a baronet, of Merville in the Baronetage of Ireland.