Natural gas viscosity is an important parameter in many gas and petroleum engineering calculations.This study presents a new empirical model for quickly calculating the natural gas viscosity.The model was derived from 4089 experimental viscosity data with varieties ranging from 0.01 to 21,and 1 to 3 of pseudo reduced pressure and temperature,respectively.The accuracy of this new empirical correlation has been compared with commonly used empirical models,including Lee et al.,Heidaryan et al.,Carr et al.,and Adel Elsharkawy correlations.The comparison indicates that this new empirical model can predict viscosity of natural gas with average absolute relative deviation percentage AARD (%) of 2.173. Natural gas viscosity is an important parameter in many gas and petroleum engineering calculations. This study presents a new empirical model for quickly calculating the natural gas viscosity. The model was derived from 4089 experimental viscosity data with ranging ranging from 0.01 to 21, and 1 to 3 of pseudo reduced pressure and temperature, respectively. The accuracy of this new empirical correlation has been compared with commonly used empirical models, including Lee et al., Heidaryan et al., Carr et al., And Adel Elsharkawy correlations.The comparison indicates that this new empirical model can predict viscosity of natural gas with average absolute relative percentage percentage AARD (%) of 2.173.