In this study, the poly(amidoamine) (PAMAM) G-2 dendrimer was applied to the jute yarn. Untreated and dendrimer treated jute yarns were then dyed with Direct Yellow 24. Dendrimer treated jute yarn showed higher dye sorption compare to untreated jute yarn. Freundlich isotherm was found to be the optimum isotherm for untreated and BET isotherm defined for dendrimer treated jute yarn. Thermodynamic parameters of dyed samples, free energy (∆G°), the enthalpy (∆H°), and the entropy (∆S°) were also evaluated. The values of ∆H° and ∆G° indicated that the sorption process was exothermic and spontaneous at low temperature.