The solution rheology of different generations of hyperbranched polyesters in N-methyl-2-pyrrolidinone (NW) solvent was examined in this study. The solutions exhibited Newtonian behavior over a wide range of polyester concentrations. Also, the relative viscosities of poly(amidoamine) (PAMAM) dendrimers in ethylenediamine were compared with those of the hyperbranched polyesters in NUP. Both types of dendtitic polymers have relative viscosities that are exponential functions of their molar function in solution. The slopes of these relative viscosity curves show a linear relationship with respect to the generation number. PAMAM dendrimers have the greater slopes for each generation, reflecting their relatively larger intrinsic. viscosity values.