The viscosity of liquid cyclopentane has been measured with a vibrating wire viscometer at temperatures from (273 to 353) K at pressures up to 45 MPa with a standard (k = 1) uncertainty of < 0.7 %. These results differ from literature values by <= +/- 1 % at T < 313 K. At T > 313 K and p up to 45 MPa, they lie within 1 % from the values obtained by extrapolation of the equation proposed by Assael et al. (Int. J. Thermophys. 2004, 25, 13-20). We have combined our measurements of viscosity with those reported by Assael and Dalaouti (High Temp.-High Pressure 2000, 32, 179-184) and Harris et al. (J. Chem. Eng. Data 2004, 49, 138-142) with densities from the modified Tait equation of Cibulka and Tagaki (J. Chem. Eng. Data 1999, 44, 1105-1128) to provide a correlation for the viscosity of cyclopentane at temperatures between (219 to 353) K and pressures below 200 MPa that represent the measured values with a standard deviation of +/- 0.4 %. Other literature values are compared with this correlation.