This study investigates the thermally stratified magnetohydrodynamic flow of Casson-Wil-liamson hybrid nano liquid around a linearly stretched vertical cylinder in a porous region. The unique aspect of this research is the inclusion of thermal stratification effects on non-Newtonian hybrid nanofluid flow. Computational solutions are derived by employing MATLAB’s Bvp4c algorithm, with velocity and thermal profiles illustrated graphically, and distinct non-dimensional factors. Shear and thermal transmission rates are also calculated and displayed in tables. Results expose that thermal stratification reduces the thermal profile, with notable heat stratification, even causing negative temperature values. It’s also shown that the Williamson hybrid nanofluid exhibits a 16.5% increase in heat transmission rate over the Williamson nanofluid and a 30.7% higher shear stress rate. The heat transmission rate is enhanced by increasing the thermal buoyancy factor but decreases with higher values of the Casson factor, thermal stratification factor, porosity factor, and Weissenberg number. Additionally, the thermal distribution increases with a higher Weissenberg number and curvature factor. These findings offer substantial potential for enhancing thermal management in various industrial applications, marking a significant contribution to fluid mechanics and nanofluid research. The outcomes align well with prior studies.