Cop4 or COP4 may refer to: 1998 United Nations Climate Change Conference Cubebol synthase, an enzyme Beta-copaene synthase, an enzyme Beta-cubebene synthase, an enzyme (+)-sativene synthase, an enzyme Orilla/Pumpkin Bay Water Aerodrome, Transport Canada location identifier COP4 The COP400 series of 4-bit microcontrollers