In this paper, a capillary viscometer is described for measurement of the viscosity of 1,1,1,2-tetrafluoroethane (HFC-134a) under high pressure. The viscosity of saturated liquid HFC-134a has been measured over the temperature range of 233.15-333.15 K. The purity of the HFC-134a sample used in the experiment is 99.95 mass %. A saturated liquid viscosity correlation has also been proposed. The experimental data for various researchers are compared with the correlation.