The nature and magnitude of the genotype by environment (GÃ—E) interactions isrnimportant to identify superior and stable genotypes under the target environments. One cultivarrnmay have the highest yield in some environments while a second cultivar may excel in others.rnHence, it is important to know the magnitude of the interactions in the selection of Genotypesrnacross several environments. Therefore, the objective of this study was to analyze genotype byrnenvironment interaction and stability of 20 Ethiopian wheat genotypes in 8 environments. Thernexperiment was conducted during 2007/08 growing seasons in a randomized complete blockrndesign with four replications. Parametric and nonparametric statistical methods were used to testrnthe significance of genotype by environment (GÃ—E) interaction and to identify stable Genotypesrnin 8 environments. Combined A NOVA and non parametric tests Kubinger and Hildebrand) ofrngenotype Ã— environment interaction indicated the presence of significant interactions, as well asrnsignificant differences between genotypes and environments. However no cross-over and noncrossoverrninteractions were detected by the de Kroon/van der Laan and Bredenkamp procedurernrespectively. According to the parametric methods, genotype G11, G10, G5 and G12 were stablernand genotypes G16, G3, G20 & G1 were unstable. According to the nonparametric methods,rngenotype G11, G10, G5, G18 & G12 were stable and genotypes G3, G16, G19, G1 and G20rniirnwere unstable. The result shows that both the parametric and nonparametric methods gave arnrelatively same result. This implied that the nonparametric stability measurements are usefulrnalternatives to parametric measurements. According to the biplot, Adet was generallyrncategorized under high yielding wheat environment as compared to the three relativelyrncategorized under low yielding environments (Holeta, Kulumsa and Sinana). Mean yieldrnperformance across environments was significantly positively correlated with RS and TOPrnmeasures (P