A study was carried out in the 2nd agro-ecological zone at the General Commission for Scientific Agricultural Research/Sirbaya Research Station/Aleppo during the growing season 2011-2012. The study aimed at evaluating the response of different varieties of lentil to supplemental irrigation. The experiment adopted a split plot design with three replicates. Two water treatments, supplemental irrigation (R) and rain feed (Ro) were applied to three varieties of lentil: IDLEB1 (D1), IDLEB1 (D2), and IDLEB1 (D3). The results showed that R was more significant than Ro at a confidence level 5% for grain, hay yield, and 100-grain weight. The differences were significant between the varieties that applied Ro; the most significant of which was D3 for grain and hay yield, and D2 for 100- grain weight. As for R, the differences were significant for grain yield (the most significant was D3) and 100-grain weight (the most significant was D2), while there was no significant difference for hay yield. There was no interaction between water treatment and the variety in terms of grain yield and 100-grain weight, while it was observed for hay yield.