The addition of surfactants has been proven to enhance stability in hybrid nanofluids which have shown promising potential in heat transfer applications due to their magnificent thermal conductivity relative to the base fluid and mono-based nanofluids. In this study, the impact of adding surfactant on the stability, thermophysical and wettability properties of Aluminium doped zinc oxide (AZO) hybrid nanofluids is experimentally investigated for the volume concentration ranging from 0.05 to 0.15 vol.% prepared by a two-step technique. Gum Arabic was added as a surfactant to base fluid with different nanoparticles to surfactant ratios (1:0.5, 1:1). The optimum surfactant concentration ratio of 1:0.5 provided the maximum thermal conductivity improvement for 0.15 vol. % of aluminium doped zinc oxide hybrid nanofluid. From zeta potential analysis, the surfactant exhibited remarkable stability for up to one week. The contact angle and surface tension were increased subject to the increment in concentration of nanoparticles up to 1:0.5 of surfactant addition. In conclusion, adding a minimal amount of surfactant can enhance hybrid nanofluids' stability and thermophysical properties.