This paper presents a theoretical study of gold nanoparticle blood flow through a tapered blood vessel with an overlapping stenosis. The variable nanofluid viscosity depending on temperature is taken into account. The governing equations for steady incompressible fluid subject to the boundary conditions are solved analytically under mild stenosis assumptions. The results are presented graphically for pertinent flow and stenosis shape parameters. The results show that as the concentration of gold nanoparticles increases, velocity increases while resistance impedance decreases. The obtained results for Au blood flow model are compared with both Cu blood and TiO2 blood flow models. The results showed that the velocity values are higher in case of Au blood flow model than the other models. This indicates that gold nanoparticles can improve blood flow and enhance the hemodynamic performance in the stenosed blood vessel.