Gregory Michael Piper (born 31 August 1957 in Coffs Harbour, New South Wales), an Australian politician, is the independent member of the New South Wales Legislative Assembly representing Lake Macquarie since 2007.
Piper also served as Mayor of City of Lake Macquarie between 2004 and 2012, prior to the enactment of the Local Government Amendment (Members of Parliament) Act, 2012 (NSW) preventing dual membership of state parliament and local council.