Sir John Borlase (1576–1648) was an English army officer and member of the Parliament of Ireland who was appointed joint Lord Justice of Ireland. He was born in 1576 in Cornwall, the eldest son of Edward Borlase of London, a mercer, and Suzannah Isham. He was educated at Kings College, Cambridge where he matriculated in 1591. He was knighted at Greenwich in 1606. Borlase died in London in 1648. He had married Alice Edwards in 1610. They had a son, Sir John Borlase, who lived and died in Ireland. A second son, Edmund, became a physician and historian in Chester.