Sir Lawrence Parsons (died 1628) was an English-born barrister, judge and politician in seventeenth-century Ireland, who enjoyed a highly successful career, despite frequent accusations of corruption and neglect of official duty. His success owed much to the patronage of his uncle Sir Geoffrey Fenton, of his cousin by marriage Richard Boyle, 1st Earl of Cork, and of the prime Royal favourite, the Duke of Buckingham. He was the ancestor of the Earl of Rosse of the second creation. He rebuilt Birr Castle, which is still the Parsons family home.