Sunflower (Helianthus annuus L.) is one of the most important oil-producing plants that it can tolerate short periods of water deficit (WD). The objective of this study was to evaluate the effects of water stress on the physiological and agronomic characteristics of four sunflower hybrids. A two-year field experiment was carried out using a randomized complete block design with four replications and a split plot arrangement. The irrigation treatments were applied based on 60 mm (full-irrigated), 120 mm (moderate water deficit) and 180 mm (extreme water deficit) of evaporation from the ‘class A’ pan evaporation. The correlation results showed that the seeds number per head was main yield components associated to seed yield when sunflower plants were grown under the full-irrigated and extreme water deficit. The results showed that the Euroflor and Allestar hybrids had highest seed yield in full and limited irrigation condition, respectively.