This study aimed to evaluate the individual effects of varying irrigation levels and irrigation water salinity on the yield and water productivity of greenhouse cucumber during two growing periods: autumn-winter (A-W) and spring-summer (S-S) at the research greenhouses of the Faculty of Agriculture, University of Tehran. Experiment 1 included four irrigation levels (I1 to I4), corresponding to 120, 100, 80 and 60% of the crop's water requirements. During the A-W season, irrigation level I2 resulted in the highest yield, measuring 5.65 kg plant-1, while irrigation level I4 achieved the highest water productivity at 40 kg m-3. In the S-S season, irrigation level I1 demonstrated the best performance, yielding 11 kg plant-1 and a water productivity of 35.69 kg m-3. Experiment 2 examined four levels of irrigation water salinity (S1 to S4), corresponding to less than 3, 3, 6, and 9 dS m-1. Across both seasons, the lowest salinity level (S1) produced the highest yield and water productivity, with measurements of 10.59 kg plant-1 and 43.31 kg m-3 in the S-S season. The negative effects of salinity were more pronounced during the S-S season due to increased evapotranspiration and salt accumulation. The results indicated that in the A-W season, reducing irrigation while maintaining economic yield or utilizing water with lower salinity enhances water productivity. However, in the S-S season, meeting the full water requirements and using water with lower salinity are crucial for achieving optimal yield and water productivity.