Abstract: The study was conducted to investigate times of irrigation, seasonal evapotranspiration, water use-production function and yield response of maize (Zea mays) to water under Tekirdag climatic conditions in Turkey. Sandoz-PX 74 variety of maize was used. Eight irrigation treatments were designed considering different combinations of irrigation application at three growth stages, vegetative (V), tasseling (T) and cob (T) together with no irrigation application (NoI). VTC treatment (irrigation at vegetative, tasseling and cob stages) was the control treatment. The highest seasonal evapotranspiration was calculated in VTC treatment, with the least water stress, as 586 mm. The highest monthly evapotranspiration was 217 mm in July. Maize yield for this treatment was 9920 kg ha‾1. The seasonal yield response factor, ky, was 0.76 and tasseling stage was the most sensitive to water stress. Control treatment might be practiced to realize the highest yield however TC treatment, with two irrigations, can be applied without major yield reduction instead of three. By this way, 26.3 % of irrigation water is saved against only 2.7 % yield reduction.