The Singapore Declaration of Commonwealth Principles was a declaration issued by the assembled Heads of Government of the Commonwealth of Nations, setting out the core political values that would form the main part of the Commonwealth's membership criteria. The Declaration was issued in Singapore on 22 January 1971 at the conclusion of the first Commonwealth Heads of Government Meeting (CHOGM). Along with the Harare Declaration, issued in 1991, it is considered one of the two most important documents to the Commonwealth's uncodified constitution.