A Alginate is one of the impression materials, which is referred to an irreversiblehydrocolloid. With all the advantages that alginate has, thus making alginate as animpression material that are needed and commonly used in the field of dentistry.Alginate is available in powder form to be mixed with the solvent medium, whichis water that will be stirred to obtain impression material. Often in stirringprocess, it is so difficult to manipulate the setting time as needed by the clinicians.Various ways have been done to be able to manipulate the setting time, one ofthem by regulating the temperature of the water that is used as the solventmedium. The aim of this research is to determine the effect of water temperatureon the setting time of the alginate impression material with the normal settingtype. The 8 oC water was used as the low water temperature, 34 oC water as thehigh water temperature, and the 18 oC and 24 oC water as the recommendedcontrols in this research. The results of average measurement of the setting timewere 270.2 seconds for the 8 oC water, 48.7 seconds for the 34 oC water, 148.9seconds for the 18 oC and 89.1 seconds for the 24 oC water. The results showedthat water temperature affects the setting time of alginate impression material asevidenced by the results of statistical test using independent T test (p> 0.05),which means there was a significant influence on the water temperature with thesetting time of the alginate impression material. It was concluded that the lowwater temperature could slow down the setting time of the alginate impressionmaterial while high water temperature could accelerate it. The research on thetemperature of the water was expected to be used as a reference for the cliniciansin manipulating the setting time as needed.