Sir Frederick Flood, 1st Baronet, KC (1741–1 February 1824), was an Irish lawyer and politician.
Flood opposed the Act of Union 1800 that merged the Kingdoms of Ireland and Great Britain.
He was called to the Irish Bar in 1763, soon attained considerable legal practice, and in the social circles of Dublin was immensely popular from his wit and oddity.
He married twice; firstly Lady Juliana Annesley, the daughter of Richard Annesley, 6th Earl of Anglesey and secondly Frances, the daughter of Sir Henry Cavendish, 1st Baronet of Doveridge, with whom he had an only surviving daughter Frances, who married Richard Solly of Walthamstow and York Place, London, whose son Frederick became Sir Fredericks's heir.
His only son died unmarried in 1800, and it was proposed to perpetuate Flood's title by creating him a baronet of the United Kingdom, with remainder to his only daughter Frances, who was married to Richard Solly, esq.
He died on 1 February 1824, before the patent for this new honour had passed the great seal, and left his estates to his grandson, Frederick, who took the name of Flood in addition to his own.