Viscount Barnewall, of Kingsland in the Parish of Donabate in the County of Dublin, was a title in the Peerage of Ireland.
It was created on 29 June 1646 for Nicholas Barnewall, who had earlier represented County Dublin in the Irish House of Commons.
The Kingsland Barnewalls were a junior branch of the family of Baron Trimleston; Nicholas's great-grandfather Sir Patrick Barnewall had achieved political eminence largely through his friendship with Thomas Cromwell and had done well out of the Dissolution of the Monasteries.
His son, the fourth Viscount, was a Roman Catholic and consequently disqualified from taking his seat in the Irish House of Lords.
The family seat was at Turvey House in Donabate, County Dublin.