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In the heterogeneous system, reaction temperature and catalyst loading are very affected to the fluid diffusivities and molecular interaction in active sites of catalyst. Theoritically, increasing both of them ensued to increases the chemical reaction rate. The aim of this research was to know how effect of reaction temperature and catalyst loading to reaction rate in esterification of oleic acid with glycerol, based on oleic acid conversion result. The experiments were carried out in batch reactor by reaction temperature from 160 to 200oC, catalyst loading of 0.5 - 2 wt % of oleic acid, reactant ratio of 3 glycerol mole /oleic acid mole, reaction time of 80 minutes, agitation speed of 600 rpm, and mordenite natural zeolite as catalyst. Observation result showed that increasing the reaction temperature and catalyst loading were accompanying by increases of oleic acid conversion. The highest conversion to reach at temperature reaction of 200oC and catalyst loading of 2 wt % that was 75.08%.