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This investigation was conducted at Bangladesh Agricultural University Germplasm Center (BAU-GPC) in order to find out the effects of irrigation intervals on the growth, yield, and fruit quality of lemon (cv. BAU lebu 3). A single factor experiment was carried out following randomized complete block design with three replications. The treatments were T0 (no irrigation), T1 (regular irrigation), T2 (Irrigation at 15 days intervals), T3 (Irrigation at 30 days intervals) and T4 (Irrigation at 45 days intervals). Ten litters of water per plant was applied during each irrigation cycle. T1 showed the best performance in respect to leaf length (5.36 cm), leaf breadth (4.86 cm), fresh weight of leaves (6.56 g), %moisture of leaves (80.91%), leaf relative water content (RWC) (79.63%), the lowest days to first flowering (21.66 days), total number of flowers/plant (53.66), the lowest days to first fruiting (6.00 days), number of fruits/plant (37.33), the least %dropped fruits/plant (15.83%), fruit length (7.90 cm), fruit breadth (5.36 cm ), fruit fresh weight (131.09 g), yield (4.9 kg), fruit moisture content (82.00%), titratable acidity (TA) (5.69%), juice content (34 ml), the lowest peel thickness (1.8 mm). Since, T2 treatment performed statistically similar results with T1 in most of the traits and it reduces the water use thus reduce the production cost than T1 treatment. Therefore, it can be concluded that T2 (irrigation at 15 application days intervals) would be optimum for lemon production.