This paper describes the beam diagnostics set at GANIL in 1986 or being designed at present. After reminding of the control system which allows to use these diagnostics efficiently, we give a brief technical description of any beam diagnostics which are used from the control room to tune and to control the accelerator. Lastly the probe locations along the beam lines and inside the cyclotrons are shown on drawings. This paper exists with few illustrations as a GANIL internal report