The experiment was conducted during the 2014-2015 cropping season in northern Ethiopia with the objectives of evaluatinge the nature and magnitude of Genotype x Environment Interaction (GEI) for oil yield of white seeded sesame genotypes and to identify stable and promising genotypes for general and specific adaptations across sesame growing areas. The experiment was conducted in Humera, Dansha, Maykadra, Sheraro, Wargiba and Gendawuha. The experiment laid out in Randomized Complete Block Designs (RCBD) with three replications across all the environments. Seventeen white seeded sesame genotypes were evaluated across six locations for two years. The combined analysis of variance revealed that highly significance difference (p<0.001) among genotypes, environments and GEI for oil yield. The grand mean oil yield over six environments was 296.6kg/ha and the mean oil yield of genotypes across six environments ranged between 125.48kg/ha in Humera to 531.21kg/ha in Sheraro, respectively. High mean oil yield variation was detected among genotypes ranged between 193.6 kg/ha for G8 and 409.4kg/ha for G1 respectively. The oil yield of genotypes varied to different environments with rank changed, this variation among genotypes indicating that selection should be based on mean seed yield, oil content and oil yield performances of the genotypes to their respective environments. According to stability models, AMMI Stability Value (ASV), Yield Stability Index (YSI)and Environmental Index (EI)land race Gumero and HuRC-4 were identified as the most stable and higher seed yield, oil content and oil yield were recommended for wider areas. While, HuRC-2and Acc 227880 were unstable even though they record

Keywords: ASV, GEI, Oil yield, Northern Ethiopia, White seeded sesame, YSI