John Blennerhassett or Hasset (by 1521 – 1573), of Barsham by Beccles, Suffolk, was an English landowner and Member of Parliament.
He was the fourth son of Sir Thomas Blennerhassett of Frenze, near Diss, Norfolk and Margaret Braham.
He entered the Inner Temple in 1535[4] In the 1540s, following the death of his elder brothers without male heirs, he inherited his family's entailed estate.
[1] He continued his career as a lawyer, served as a legal adviser to Thomas Howard, 3rd Duke of Norfolk[2] and was called to the bench in 1550.
[10] His cousin, Sir Edward Blennerhassett of Horsford, was the father of another Sir John Blennerhassett, a barrister who became Chief Baron of the Irish Exchequer, and also of Thomas and Edward, who played a part in the Plantation of Ulster.