An experimental investigation of local free convection heat transfer rates from a horizontal, isothermal cylinder to non-Newtonian, power-law fluids has been conducted. Experimental data were obtained employing a cylindrical test section 2.304 in, dia and 8.018 in. long, constructed of twenty aluminum segments each independently, electrically heated. Non-Newtonian fluids utilized included four aqueous, carboxypolymethylene solutions. Both local and average Nusselt number results were compared with theoretical and empirical models.