Determination of evapotranspiration is an important issue particularly for water management considering its role as part of the hydrological cycle associated with the losses. Especially in the countries like Turkey, where the economy is majorly based on agriculture, water management is a crucial application. For an accurate water management, possible losses should be determined. For this aim, evapotranspiration data was collected by micrometeorological methods from an agricultural system over maize crop surface for 2010-2011 growing seasons in Thrace Region which is located in the northwestern part of Turkey, Kırklareli. Further, obtained values were compared to the calculated values by the equations which take part in literature. For the study area, reference evapotranspiration over maize and potential evapotranspiration values were calculated to use in water budget calculations