The Putney Debates were a series of discussions between members of the New Model Army – a number of the participants being Levellers – concerning the makeup of a new constitution for Britain.
After seizing the City of London from Presbyterian opponents in August 1647, the New Model Army had set up its headquarters at Putney, in the county of Surrey (now in South West London). The debates began on 28 October 1647 at the Church of St. Mary the Virgin, but moved to the nearby lodgings of Thomas Grosvenor, Quartermaster General of Foot, the following day. The debates lasted until 11 November.
Earlier that summer Oliver Cromwell (then Member of Parliament for Cambridge), Henry Ireton (Cromwell's son-in-law) and other officers, known as the Grandees, attempted to negotiate a settlement with Charles I of England in the aftermath of the First Civil War. Their proposals, termed the Heads of Proposals, included provisions for social justice, but the monarchy and House of Lords would have retained a power of veto over the House of Commons. A further feature of the Heads of Proposals was that the king would be restored before the issues of the soldiers' indemnity and arrears were entrenched in law. This was contrary to the New Model Army's Declaration of 14 June 1647 and consequently the Heads of Proposals lost the support of the more radical elements among the military and civilian populations.