Thirteen sesame genotypes were evaluated seed yield/fad., under eight different environments i.e. These environments are the combinations between two different locations in Egypt, Ismailia Research Station and Shandawel Research Station. during four successive summer seasons of 2018 to 2021. The results showed that Mean performance for seed yield/fed ranged from 6.08ard/fed for genotype M575 to 4.7 ard/fed for line 59-3-5 in Ismailia location, while Shandawell location seed yield ranged from 7.86 ard/fed for LOCAL 219 to 6.17 ard/fed for Shandawell 3. Pooled analysis of variance revealed that the mean squares among the genotypes were highly significant for seed yield. Stability analysis indicated that, genotype x environment (GxE) "linear" was significant for seed yield, indicating that genotypes differed in their response to changes in the environments. G x E was also significant when tested against pooled deviation for seed yield/fad., suggesting that the linear regression and the deviation from linearity were important for describing stability for seed yield. Stability parameters analysis was assessed using regression coefficient (bi), mean squares of deviation from regression (S 2 d), Genetic superiority index (pi), determination coefficient values (R2) and coefficient of variability (C.V). The correlation coefficients of relations between the mean seed yield and different stability parameters, mean seed yield and Pi were highly significantly positive correlation (r = 0.92**). The genotypes Shandawel 3, Line53-3 and Line59-3-5 could be considered stable genotype in terms of most studied traits.