Gregory Cromwell, 1st Baron Cromwell, KB (c. 1520 – 4 July 1551) was an English peer. He was the only son of the Tudor statesman Thomas Cromwell, 1st Earl of Essex (c. 1485 – 1540) and Elizabeth Wyckes (d. 1529). Gregory's father Thomas Cromwell rose from obscurity to become the chief minister of Henry VIII, who attempted to modernize government at the expense of the privileges of the nobility and church. He used his office to promote religious reform and was one of the strongest advocates of the English Reformation.