This paper investigates the impact of thermal radiation, viscous dissipation, and chemical reaction on the stagnation point flow of Williamson nanofluid over an exponentially stretching sheet. The study utilizes similarity transformations to convert partial differential equations (PDEs) into ordinary differential equations (ODEs), and the simulation is carried out using the homotopy analysis method (HAM). Comparisons with existing literature validate the accuracy of our findings for specific scenarios. Graphs and tables are presented to illustrate the behavior of skin friction, Nusselt number, and Sherwood numbers for various values of flow parameters. Notably, the skin friction coefficient exhibits enhancement with an increase in the Williamson fluid parameter.