Sir Thomas Hallifax (23 February 1722 – 7 February 1789), of Gordon House, Enfield, Middlesex, was an English banker, Lord Mayor of London and Member of Parliament.
He was born the younger son of a Barnsley clockmaker and moved to London, where he found work as a bank clerk.
He was briefly a Member (MP) of the Parliament of Great Britain for Coventry from December 1780 to February 1781 before being unseated on petition but then returned unopposed for Aylesbury to sit from 1784 to 1789.
He had married twice, firstly Penelope, the daughter of Richard Thomson of Ewell, Surrey and secondly Margaret, the daughter and coheiress of wealthy merchant John Saville of Enfield, Middlesex.
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