Robert Greville, 2nd Baron Brooke (May 1607 – 4 March 1643) was an English politician, military officer and peer. A leading opponent of Charles I of England, when the First English Civil War began in August 1642, he was appointed as the commander of Parliamentarian forces in Staffordshire and Warwickshire. He was killed by a Royalist sniper at the Siege of Lichfield on 2 March 1643.
Greville was adopted at the age of four by his childless distant cousin Fulke Greville, 1st Baron Brooke, inheriting both his title and Warwick Castle in 1628. A religious Independent, he was closely associated with other Puritan opponents of the Stuart regime, including John Pym, John Hampden and Arthur Haselrig. From 1640 to 1642, he and Lord Saye were central to securing support in the House of Lords for legislation passed by the House of Commons.